Add workflow_dispatch to publish-docker.yml for manual triggers

Allows manual triggering when release.published webhook fails.
Related to #774

.github/workflows/publish-docker.yml

@@ -3,9 +3,15 @@ name: Publish Docker Images
 on:
   release:
     types: [published]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag (e.g., v4.34.0)'
+        required: true
+        type: string
 
 concurrency:
-  group: docker-publish-${{ github.event.release.tag_name }}
+  group: docker-publish-${{ github.event.release.tag_name || inputs.tag }}
   cancel-in-progress: false
 
 jobs:
@@ -20,7 +26,7 @@ jobs:
       - name: Extract version from release tag
         id: version
         run: |
-          TAG="${{ github.event.release.tag_name }}"
+          TAG="${{ github.event.release.tag_name || inputs.tag }}"
           VERSION="${TAG#v}"
           echo "tag=${TAG}" >> $GITHUB_OUTPUT
           echo "version=${VERSION}" >> $GITHUB_OUTPUT