Test workflow_dispatch event

Author: adolfintel

.github/workflows/docker-publish.yml

@@ -16,6 +16,10 @@ on:
     branches: ["{{is_default_branch}}"]
   release:
     types: [published]
+  workflow_dispatch:
+    branches: ["*"]
+    # Publish semver tags as releases.
+    tags: ["*.*.*"]
 
 env:
   # Use docker.io for Docker Hub if empty