Fix workflow

.github/workflows/irods-integration.yml

@@ -1,12 +1,14 @@
+---
 name: Run integration tests against iRODS
-
 on:
-  push:
   pull_request:
+  push:
+    branches:
+      - main
 
 jobs:
   molecule:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     if: |
       ${{ ! contains(github.event.head_commit.message, '#nointegrationtests') &&
             ( github.event_name == 'push' ||