Fix definition for image names on release

Author: rjhenry

.github/workflows/release.yml

@@ -3,7 +3,7 @@ on:
   push:
     # Sequence of patterns matched against refs/tags
     tags:
-      - '*' # Push events to matching v*, i.e. v1.0, v0.4.4
+      - '*' # Push on all tag events
 
 jobs:
   build:
@@ -71,7 +71,9 @@ jobs:
       id: docker_meta
       uses: docker/metadata-action@v4
       with:
-        images: solidnerd/bookstack,ghcr.io/solidnerd/docker-bookstack
+        images: |
+          solidnerd/bookstack
+          ghcr.io/solidnerd/docker-bookstack
         tags: |
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}