ci: only build on main branch

pschmitt · vladdoster · commit 86d6c9ee1523 · 2023-06-06T00:30:33.000-05:00
diff --git a/.github/workflows/containers.yaml b/.github/workflows/containers.yaml
@@ -1,6 +1,10 @@
 name: Container images
 
-on: [push, workflow_dispatch]
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
 
 jobs:
   build-containers-with-zsh:
