Every version built by CI is dirty

This is usually caused by some files created by CI pipeline like build artifacts or test reports, e.g. dist/my_package.whl or reports/unit.xml. If these files are not mentioned in .gitignore file they will be recognized by git as untracked. Because of that git status will report that you have uncommitted (dirty) changes in the index, so setuptools-git-versioning will detect current version as dirty.

You should such files to the .gitignore file. In most the cases adding these lines solves the issue:

build/
dist/
eggs/
*.egg*
venv

See full example.