Trigger CI for PRs to main

Signed-off-by: Test User <test@example.com>

Author: Test User

.github/workflows/ci-rust-python-package.yaml

@@ -2,7 +2,6 @@ name: CI Rust Python Package Plugins
 
 on:
   push:
-    branches: [main]
     paths:
       - "Cargo.toml"
       - "Cargo.lock"
@@ -16,6 +15,7 @@ on:
       - "DEVELOPING.md"
       - "TESTING.md"
   pull_request:
+    branches: [main]
     paths:
       - "Cargo.toml"
       - "Cargo.lock"

tests/test_plugin_catalog.py

@@ -271,6 +271,7 @@ def test_ci_workflow_uses_make_targets_for_plugin_checks(self) -> None:
         workflow = (
             REPO_ROOT / ".github" / "workflows" / "ci-rust-python-package.yaml"
         ).read_text()
+        self.assertIn("pull_request:\n    branches: [main]", workflow)
         self.assertNotIn("Validate plugin catalog", workflow)
         self.assertIn("run: make ci", workflow)
         self.assertIn("tools/plugin_catalog.py ci-selection", workflow)