Set image tag for exporters to latest if being merged, commit hash otherwise

Signed-off-by: Eric Sauer <esauer@redhat.com>

Author: etsauer

.github/workflows/test-images.yml

@@ -50,13 +50,15 @@ jobs:
   create-images:
     runs-on: ubuntu-latest
     needs: setup
+    env:
+      BRANCH_REF: ${{ steps.variables.outputs.branch_ref }}
+      PR_TYPE: ${{ steps.variables.outputs.pr_type }}
+      PR_NUMBER: ${{ steps.variables.outputs.pr_number }}
+      COMMIT_HASH: ${{ steps.variables.outputs.commit_hash }}
+      IMAGE_TAG: ${{ case(github.ref == 'refs/heads/main', 'latest', 'v' + steps.variables.outputs.commit_hash) }}
+
     steps:
       - name: Validate outputs from setup jobs
-        env:
-          BRANCH_REF: ${{ steps.variables.outputs.branch_ref }}
-          PR_TYPE: ${{ steps.variables.outputs.pr_type }}
-          PR_NUMBER: ${{ steps.variables.outputs.pr_number }}
-          COMMIT_HASH: ${{ steps.variables.outputs.commit_hash }}
         run: echo "$BRANCH_REF, $PR_TYPE, $PR_NUMBER, $COMMIT_HASH"
       - name: Checkout code
         uses: actions/checkout@v4
@@ -67,7 +69,7 @@ jobs:
         uses: "./.github/workflow_templates/build_push_exporters"
         with:
           image: rc-pelorus-exporter
-          tags: ${{ needs.setup.outputs.commit_hash }}
+          tags: v${{ needs.setup.outputs.commit_hash }}
           quay_imagenamespace: ${{ secrets.QUAY_IMAGE_NAMESPACE }}
           quay_username: ${{ secrets.QUAY_USERNAME }}
           quay_password: ${{ secrets.QUAY_PASSWORD }}