Publish Docker image only on tags

Co-Authored-By: Codex <noreply@openai.com>

.github/workflows/docker-publish.yml

@@ -2,8 +2,6 @@ name: Publish Docker Image
 
 on:
   push:
-    branches:
-      - main
     tags:
       - "v*"
   workflow_dispatch:
@@ -43,8 +41,7 @@ jobs:
         with:
           images: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
           tags: |
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=ref,event=branch
+            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
             type=ref,event=tag
             type=sha
             type=semver,pattern={{version}}