chore: print check result to stdout

.github/workflows/build-ci.yml

@@ -114,6 +114,7 @@ jobs:
           echo "Failed to query image's existence with status code ${STATUS_CODE}"
           exit 1
         fi
+        echo "${CI_SCORECARD_IMG}:${{ steps.get-image-tag.outputs.tag }} exists: $EXIST"
         echo "exist=$EXIST" >> $GITHUB_OUTPUT
     - name: Install podman v4
       run: |