fixup! ci: tag and push to envbox-preview on merge to main

Author: johnstcn

.github/workflows/ci.yaml

@@ -260,8 +260,6 @@ jobs:
         run: make -j build/image/envbox
 
       - name: Tag and push envbox-preview
-        # Only push the image on a merge to main
-        if: github.ref == 'refs/heads/main'
         run: |
           VERSION=$(./scripts/version.sh)-dev-$(git rev-parse --short HEAD)
           BASE=ghcr.io/coder/envbox-preview