Add tag name suffix

Author: lukamac

.github/workflows/github-actions-demo.yml

@@ -38,6 +38,7 @@ jobs:
           labels: |
             org.opencontainers.image.vendor=pulp-platform
             org.opencontainers.image.description=Image for testing the pulp-nnx library
+          tags: suffix=-test
 
       - run: echo "Docker tags ${{ steps.meta.outputs.tags }}"
       - run: echo "Docker labels ${{ steps.meta.outputs.labels }}"