Setup pre-commit and ruff #8384

Job	Run time
Build and check documentation	1m 31s
End-to-end tests, chromium	4m 0s
Run the Django test suite (main)	20m 8s
End-to-end tests, firefox	4m 17s
Run the Django test suite (elastic)	4m 36s
End-to-end tests, webkit	4m 14s
Run the Django test suite (openklant)	2m 15s
End-to-end tests, msedge	4m 9s
Run the Django test suite (sequential)	3m 32s
Check that documentation for configuration steps is up-to-date	0s
Upload coverage information to codecov	15s
Build (and push) Docker image	1m 42s
	50m 39s

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