fix: correct TAGS environment variable for Docker image signing

Author: argentinaluiz

.github/workflows/ci.yaml

@@ -139,7 +139,7 @@ jobs:
       - name: Sign the published Docker image
         if: github.event_name != 'pull_request'
         env:
-          TAGS: ${{ steps.meta.outputs.tags }} docker metadata tag1,tag2,tag3
+          TAGS: ${{ steps.meta.outputs.tags }}
           DIGEST: ${{ steps.build-final.outputs.digest }}
         run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}