Hotfix: Fix CI unit test after CI refactor (#36004)

* Hotfix: Fix CI unit test after CI refactor

lib/spack/spack/test/cmd/ci.py

@@ -1834,11 +1834,7 @@ def test_ci_generate_prune_env_vars(
 ):
     """Make sure environment variables controlling untouched spec
     pruning behave as expected."""
-    os.environ.update(
-        {
-            "SPACK_PRUNE_UNTOUCHED": "TRUE",  # enables pruning of untouched specs
-        }
-    )
+    os.environ.update({"SPACK_PRUNE_UNTOUCHED": "TRUE"})  # enables pruning of untouched specs
     filename = str(tmpdir.join("spack.yaml"))
     with open(filename, "w") as f:
         f.write(
@@ -1846,11 +1842,12 @@ def test_ci_generate_prune_env_vars(
 spack:
   specs:
     - libelf
-  gitlab-ci:
-    mappings:
+  ci:
+    pipeline-gen:
+    - submapping:
       - match:
           - arch=test-debian6-core2
-        runner-attributes:
+        build-job:
           tags:
             - donotcare
           image: donotcare