This patch disables ansible-lint `always_run` flag, as this was
making patches that did not change any YAML file take longer in
the pre-commit step, as ansible-lint was executed with no parameter,
thus, searching and evaluating all YAML files in the repository.
With this change, if no YAML file is modified, ansible-lint is skipped.
With the parameter `args: ['.']`, yamllint would run over every
file during pre-commit, including those not being commited, and it
would allow for false negatives, not allowing a commit, even if
commited yaml files had no issues, but another file, not par of the
commit, had.
By changing the yamllint parameter to `files: \.(yaml|yml)$` it
will only check files being commited, preventing false negatives,
and allowing for faster commits.
This patch adds another lever of linter checking for ansible-freeipa
by enabling linters to run on the developer machine, before pushing
changes to be evaluated on the CI, allowing code fixes without
wating for CI to run the linters on the repository.
To enable pre-commit hooks, `pre-commit` is used, and was added to
requirements-dev.txt, and can be installed with pip
(`pip install -r requirements-dev.txt`). Once installed, on every
commit, YAML and python files on the commit will be evaluated.
If one needs to bypass the pre-commit linters, `git commit` can be
issued with `--no-verify`.
The linters will not be removed from the CI, as a commit can be
performed without running the checks.
