Add ansible-lint GitHub Action (#6).

[jerome-caucat]

@JMLX42 This adds a pre-commit hook and a GitHub Action running ansible-lint.

If I understand correctly merging can be protected against PR that do not pass linting by enabling the option Require status checks to pass before merging and the ansible-lint status check in the repository settings -> Branches -> Protect matching branches (the ansible-lint status check should appear in the list once this PR is merged).

I had to add two new ignored errors in the .ansible-lint skip_list:

• '106' # Ignore error [106] Role name does not match ^[a-z][a-z0-9_]+$ pattern.
• '208' # Ignore error [208] File permissions unset or incorrect.

Note that:

• The pre-commit uses a regex and will lint all the .yml and .yaml files.
• However globbing is currently broken in the ansible-lint-action:
  • https://github.com/ansible/ansible-lint-action/issues/30
  • So I temporarily had to list all the yaml files.
  • I will have to create an issue and fix this when the ansible-lint-action is fixed.
• Also I could not explicitly set the version of ansible and ansible-lint used due to another bug:
  • https://github.com/ansible/ansible-lint-action/issues/41
  • I will have to create an issue and fix this when the ansible-lint-action is fixed.