Plea for awesome Flake8 feature

[reactive-firewall]

Describe the solution you'd like
A clear and concise description of what you want to happen.

Implement a Flake8 setup in the template project.

Describe alternatives you've considered
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• not implementing - lacks any strong linting enforcement
• ruff - should set that up too

Additional context
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• see DRAFT: Feature add details to known rules flake8-cq#20