run tests on push to main

Author: haarg

.github/workflows/test.yml

@@ -1,6 +1,11 @@
----
 name: Test container build
-on: [pull_request, workflow_dispatch]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
 jobs:
   docker:
     runs-on: ubuntu-22.04