ci(ghcr): fix tags format to newline-separated for build-push-action

Author: Cruzadera

.github/workflows/publish-ghcr.yml

@@ -38,13 +38,20 @@ jobs:
         run: |
           IMAGE_OWNER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
           IMAGE="ghcr.io/${IMAGE_OWNER}/filmaffinity-scores"
-          TAGS="${IMAGE}:latest ${IMAGE}:${{ github.sha }}"
+          # build-push-action requires newline-separated tags
+          TAGS="${IMAGE}:latest
+          ${IMAGE}:${{ github.sha }}"
           if [[ "${GITHUB_REF}" == refs/tags/* ]]; then
             TAG_NAME=${GITHUB_REF#refs/tags/}
-            TAGS="${TAGS} ${IMAGE}:${TAG_NAME}"
+            TAGS="${TAGS}
+          ${IMAGE}:${TAG_NAME}"
           fi
           echo "image=${IMAGE}" >> "$GITHUB_OUTPUT"
-          echo "tags=${TAGS}" >> "$GITHUB_OUTPUT"
+          {
+            echo "tags<<EOF"
+            echo "${TAGS}"
+            echo "EOF"
+          } >> "$GITHUB_OUTPUT"
 
       - name: Build and push
         uses: docker/build-push-action@v4