[ci] Skip the memory impact target build when the base test is missing (#20410)

.github/workflows/ci.yml

@@ -1422,31 +1422,27 @@ jobs:
             echo "::warning::ci_memory_impact_extract.py not found on target branch, skipping memory impact analysis"
           fi
 
-      # Check if test files exist on the target branch for the requested
-      # components and platform. When a PR adds new test files for a platform,
-      # the target branch won't have them yet, so skip instead of failing.
-      # This check must be done here (not in determine-jobs.py) because
-      # determine-jobs runs on the PR branch and cannot see what the target
-      # branch has.
+      # The build below uses --base-only, so skip unless the target branch has
+      # test.<platform>.yaml for every requested component (test-*.yaml
+      # variants alone compile nothing, and a partial set would compare a
+      # smaller target build against the PR build). Checked here, not in
+      # determine-jobs.py, because determine-jobs runs on the PR branch and
+      # cannot see the target branch.
       - name: Check for test files on target branch
         id: check-tests
         if: steps.check-script.outputs.skip != 'true'
         run: |
           components='${{ toJSON(fromJSON(needs.determine-jobs.outputs.memory_impact).components) }}'
           platform="${{ fromJSON(needs.determine-jobs.outputs.memory_impact).platform }}"
-          found=false
+          missing=""
           for component in $(echo "$components" | jq -r '.[]'); do
-            # Check for test files matching the platform (test.platform.yaml or test-*.platform.yaml)
-            for f in tests/components/${component}/test*.${platform}.yaml; do
-              if [ -f "$f" ]; then
-                found=true
-                break 2
-              fi
-            done
+            if [ ! -f "tests/components/${component}/test.${platform}.yaml" ]; then
+              missing="${missing} ${component}"
+            fi
           done
-          if [ "$found" = false ]; then
+          if [ -n "$missing" ]; then
             echo "skip=true" >> $GITHUB_OUTPUT
-            echo "::warning::No test files found on target branch for platform ${platform}, skipping memory impact analysis"
+            echo "::warning::No test.${platform}.yaml on target branch for${missing}, skipping memory impact analysis"
           else
             echo "skip=false" >> $GITHUB_OUTPUT
           fi