Alinux isc buildcache (#30462)

Add two new stacks targeted at x86_64 and arm, representing an initial list of packages 
used by current and planned AWS Workshops, and built in conjunction with the ISC22
announcement of the spack public binary cache.

Co-authored-by: Scott Wittenburg <scott.wittenburg@kitware.com>

share/spack/gitlab/cloud_pipelines/.gitlab-ci.yml

@@ -52,12 +52,22 @@ default:
       - runner_system_failure
       - stuck_or_timeout_failure
 
+.generate-aarch64:
+  extends: [ ".generate" ]
+  tags: ["spack", "aws", "public", "medium", "aarch64"]
+
 .pr-generate:
   extends: [ ".pr", ".generate" ]
 
+.pr-generate-aarch64:
+  extends: [ ".pr", ".generate-aarch64" ]
+
 .protected-generate:
   extends: [ ".protected", ".generate" ]
 
+.protected-generate-aarch64:
+  extends: [ ".protected", ".generate-aarch64" ]
+
 .build:
   stage: build
 
@@ -423,6 +433,86 @@ data-vis-sdk-protected-build:
     - artifacts: True
       job: data-vis-sdk-protected-generate
 
+########################################
+# AWS ISC Applications (x86_64)
+########################################
+
+# Call this AFTER .*-generate
+.aws-isc-overrides:
+  # This controls image for generate step; build step is controlled by spack.yaml
+  # Note that generator emits OS info for build so these should be the same.
+  image: { "name": "ghcr.io/spack/e4s-amazonlinux-2:v2022-03-21", "entrypoint": [""] }
+
+.aws-isc:
+  variables:
+    SPACK_CI_STACK_NAME: aws-isc
+
+aws-isc-pr-generate:
+  extends: [ ".aws-isc", ".pr-generate", ".aws-isc-overrides" ]
+  tags: ["spack", "public", "medium", "x86_64_v4"]
+
+aws-isc-protected-generate:
+  extends: [ ".aws-isc", ".protected-generate", ".aws-isc-overrides" ]
+  tags: ["spack", "public", "medium", "x86_64_v4"]
+
+aws-isc-pr-build:
+  extends: [ ".aws-isc", ".pr-build" ]
+  trigger:
+    include:
+      - artifact: jobs_scratch_dir/cloud-ci-pipeline.yml
+        job: aws-isc-pr-generate
+    strategy: depend
+  needs:
+    - artifacts: True
+      job: aws-isc-pr-generate
+
+aws-isc-protected-build:
+  extends: [ ".aws-isc", ".protected-build" ]
+  trigger:
+    include:
+      - artifact: jobs_scratch_dir/cloud-ci-pipeline.yml
+        job: aws-isc-protected-generate
+    strategy: depend
+  needs:
+    - artifacts: True
+      job: aws-isc-protected-generate
+
+
+# Parallel Pipeline for aarch64 (reuses override image, but generates and builds on aarch64)
+
+.aws-isc-aarch64:
+  variables:
+    SPACK_CI_STACK_NAME: aws-isc-aarch64
+
+aws-isc-aarch64-pr-generate:
+  extends: [ ".aws-isc-aarch64", ".pr-generate-aarch64", ".aws-isc-overrides" ]
+
+aws-isc-aarch64-protected-generate:
+  extends: [ ".aws-isc-aarch64", ".protected-generate-aarch64", ".aws-isc-overrides" ]
+
+aws-isc-aarch64-pr-build:
+  extends: [ ".aws-isc-aarch64", ".pr-build" ]
+  trigger:
+    include:
+      - artifact: jobs_scratch_dir/cloud-ci-pipeline.yml
+        job: aws-isc-aarch64-pr-generate
+    strategy: depend
+  needs:
+    - artifacts: True
+      job: aws-isc-aarch64-pr-generate
+
+aws-isc-aarch64-protected-build:
+  extends: [ ".aws-isc-aarch64", ".protected-build" ]
+  trigger:
+    include:
+      - artifact: jobs_scratch_dir/cloud-ci-pipeline.yml
+        job: aws-isc-aarch64-protected-generate
+    strategy: depend
+  needs:
+    - artifacts: True
+      job: aws-isc-aarch64-protected-generate
+
+
 ########################################
 # Spack Tutorial
 ########################################