add docker builds also for each push to the livekit branch

.github/workflows/publish.yaml

@@ -3,6 +3,8 @@ name: Build & publish images to the package registry for tags
 on:
   release:
     types: [published]
+  push:
+    branches: [livekit]
 
 env:
   REGISTRY: ghcr.io
@@ -58,6 +60,10 @@ jobs:
         uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=sha,format=short,event=branch
+            type=semver,pattern={{version}}
+            type=raw,value=latest-ci,enable={{is_default_branch}}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6