ci: enable merge groups

Signed-off-by: Martin Kröning <[email protected]>

.github/workflows/publish.yml

@@ -1,11 +1,12 @@
 name: Publish
 
 on:
-  pull_request:
   push:
     branches:
       - main
   workflow_dispatch:
+  pull_request:
+  merge_group:
 
 jobs:
   docker:
@@ -14,12 +15,12 @@ jobs:
     steps:
       - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v3
-        if: github.event_name != 'pull_request'
+        if: github.ref_name == 'main'
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - uses: docker/build-push-action@v5
         with:
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ github.ref_name == 'main' }}
           tags: ghcr.io/hermit-os/hermit-toolchain:latest