Apply suggestions from code review

Co-authored-by: Arjun Verma <[email protected]>

.github/test_on_push.yml

@@ -3,7 +3,9 @@ name: pybamm_cookiecutter
 on:
   workflow_dispatch:
   pull_request:
-  push: [main]
+  push:
+    branches:
+    - main
 jobs:
   style:
     runs-on: ubuntu-latest

tests/test_project_generation.py

@@ -24,7 +24,7 @@ def test_bake_custom_project(cookies: Cookies, custom_template):
     Testing if the projects exists in the tempdir
     """
     result = cookies.bake(template=str(custom_template))
-    assert result.exit_code == 0, "Exited with code 0"
+    assert result.exit_code == 0, f"Exited with code {result.exit_code}, expected 0"
     assert result.exception is None, result.exception
     assert result.project_path.name == "pybamm_cookie"
-    assert result.project_path.is_dir(), "Project directory not found"
+    assert result.project_path.is_dir(), f"Project directory {result.project_path} not found"