Fix missing block indicator in workflow file

Author: rjhenry

.github/workflows/release.yml

@@ -72,7 +72,7 @@ jobs:
       uses: docker/metadata-action@v4
       with:
         images: solidnerd/bookstack,ghcr.io/solidnerd/docker-bookstack
-        tags:
+        tags: |
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}
           type=semver,pattern={{major}}.{{minor}}.{{patch}}