add flake8

.gitlab-ci.yml

 stages:
-  - test
+    - code_quality
+    - test
 
 include:
     - local: 'templates/python/testing/pytest/pytest.yml'
+    - local: 'templates/python/code_quality/flake8/flake8.yml'
 
 pytest:
     variables:
-        IMAGE_TAG: "latest"
         PROJECT_PATH: "tests/pytest_project"
         PYTHON_SETUP: "pip install ${PROJECT_PATH} pytest"
+
+flake8:
+    variables:
+        IMAGE_TAG: "latest"
+        PROJECT_PATH: "tests/flake8_project"
+        PYTHON_SETUP: "pip install ${PROJECT_PATH} flake8"

pyproject.toml

+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.metadata]
+allow-direct-references = true
+
+[project]
+name = "r2devops_catalog"
+version = "0.1.0"
+authors = [
+    { name = "Dorian Turba", email = "author.name@example.com" },
+]
+description = "A description of what the package is for."

tests/flake8_project/pyproject.toml

+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "flake8_project"
+version = "0.1.0"
+authors = [
+    { name = "Author Name", email = "author.name@example.com" },
+]
+description = "A description of what the package is for."

tests/pytest_project/pyproject.toml

@@ -3,7 +3,7 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [project]
-name = "test_project"
+name = "pytest_project"
 version = "0.1.0"
 authors = [
     { name = "Author Name", email = "author.name@example.com" },

tests/pytest_project/src/pytest_project/__init__.py

+from pytest_project.main import main
+
+__all__ = ['main']

tests/pytest_project/src/pytest_project/main.py

+"""Sample main module."""
+
+
+def main() -> bool:
+    """Sample main function."""
+    print("Hello, world!")
+    return True
+
+
+if __name__ == '__main__':
+    main()

tests/pytest_project/tests/test_main.py

 """Sample test module."""
 
-from test_project import main
+from pytest_project import main
 
 
 def test_main():