Tirsvad
fed7e17527
Add .gitea/workflows/ci.yml: tests, ruff check, ruff format --check and mypy on every push and pull request, with Python 3.13 on ubuntu-latest. Two things in the first draft would have failed: - It installed the dev tools with `pip install -e ".[dev]"`, but the project declares them as a dependency group, not an extra. pip only warns and exits 0, so pytest, ruff and mypy were missing and the first step died with "No module named pytest". It now runs `pip install -e . --group dev`. - The 10 test cases that use Tk need a display, which a CI runner does not have. The workflow now installs xvfb and python3-tk and runs the tests with xvfb-run, so the display requirement accepted on RC-006 still holds. No test code changes. Checked locally: the YAML parses to the intended eight steps, the install line gives all three tools in a clean environment, and the test, lint, format and type commands pass as written. The Linux display steps have not run yet; they need a runner.