Restrict deployment workflow to main

.forgejo/workflows/ci.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - main
   pull_request:
+    branches:
+      - main
 
 jobs:
   check:
@@ -57,7 +59,7 @@ jobs:
     runs-on: docker
     needs:
       - check
-    if: ${{ github.event_name == 'push' }}
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
 
     steps:
       - name: Install deploy tooling