ci: add pre-commit, molecule, github workflows + chore

[juju4]

Proposed changes

This implements continuous integration through

• pre-commit: mostly client-side
• molecule pipeline (default + github action) through docker
• default-bare github action directly on image to test without docker+systemd limitations

This also includes chore to fix lint issues (ansible-lint, yamllint mostly).
Redhat platform is marked experimental as failing inside molecule docker and can't be tested bare in github workflows.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• Lint and unit tests pass locally with my changes (if applicable) - with this PR
• I have run pre-commit (pre-commit in the repo) - added with PR too
• I have added tests that prove my fix is effective or that my feature works - object of the PR
• I have added necessary documentation (if appropriate) - no but feel free to suggest where this should go
• Linked to the relevant github issue or github discussion - issues or discussions not opened in repo

[benjamin-thinkst]

@juju4 This looks great. When you get a moment could you rebase to avoid merge conflicts.

[juju4]

upstream merge done

[theidiotyouyellat]

@juju4 This is awesome! Question on the .github/workflows/galaxy.yml: should it point to theidiotyouyellat.opencanary or would it make more sense to have thinkst.opencanary? Forgive my ignorance if this is a stupid question.

[juju4]

galaxy.yml should match what is in meta
https://github.com/thinkst/ansible-role-opencanary/blob/master/meta/main.yml#L3
That's why I left it as is.