diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
index 6117278bcf0..3a1d8372159 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-ahug/spack.yaml
@@ -254,6 +254,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
index 5feaad01cff..61119183030 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/aws-isc/spack.yaml
@@ -175,6 +175,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
index 53d8cefc4af..006962e287c 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/build_systems/spack.yaml
@@ -47,6 +47,9 @@ spack:
       - cd ${SPACK_CONCRETE_ENV_DIR}
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
index de1e68fcd41..4e951d60c51 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/data-vis-sdk/spack.yaml
@@ -60,6 +60,9 @@ spack:
       - cd ${SPACK_CONCRETE_ENV_DIR}
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
index a064faf4921..1afc04084e3 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
@@ -280,6 +280,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - export PATH=/bootstrap/runner/view/bin:${PATH}
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
index b6583d3a4e0..67e75213a36 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s/spack.yaml
@@ -270,6 +270,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild --tests > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-cpu/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-cpu/spack.yaml
index 90f8428ca35..cf00c49ab5f 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-cpu/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-cpu/spack.yaml
@@ -104,6 +104,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-cuda/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-cuda/spack.yaml
index 849b9ae08b9..54933b20648 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-cuda/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-cuda/spack.yaml
@@ -107,6 +107,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/ml-rocm/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/ml-rocm/spack.yaml
index e49e805fc72..15c5466230f 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/ml-rocm/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/ml-rocm/spack.yaml
@@ -110,6 +110,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
index ce93b57303a..3f4ed6f838f 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/radiuss-aws/spack.yaml
@@ -75,6 +75,9 @@ spack:
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
       - mkdir -p ${SPACK_ARTIFACTS_ROOT}/user_data
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild > >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt) 2> >(tee ${SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt >&2)
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
index fc7700be11f..05da60136bf 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/radiuss/spack.yaml
@@ -77,6 +77,9 @@ spack:
       - cd ${SPACK_CONCRETE_ENV_DIR}
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild
diff --git a/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
index 58ee39c1139..1cc2af4b888 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/tutorial/spack.yaml
@@ -79,6 +79,9 @@ spack:
       - cd ${SPACK_CONCRETE_ENV_DIR}
       - spack env activate --without-view .
       - spack config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{architecture}/{compiler.name}-{compiler.version}/{name}-{version}-{hash}'"
+      # AWS runners mount E4S public key (verification), UO runners mount public/private (signing/verification)
+      - if [[ -r /mnt/key/e4s.gpg ]]; then spack gpg trust /mnt/key/e4s.gpg; fi
+      # UO runners mount intermediate ci public key (verification), AWS runners mount public/private (signing/verification)
       - if [[ -r /mnt/key/intermediate_ci_signing_key.gpg ]]; then spack gpg trust /mnt/key/intermediate_ci_signing_key.gpg; fi
       - if [[ -r /mnt/key/spack_public_key.gpg ]]; then spack gpg trust /mnt/key/spack_public_key.gpg; fi
       - spack --color=always --backtrace ci rebuild