Integrate a GHA workflow running `ansible-test`

[webknjaz]

Description

(DISCLAIMER: this is a drive-by contribution, feel free to adapt it, I'm leaving the "allow maintainers to edit" checkbox on)

The patch merely wires up ansible-test sanity w/ GHA. Thought you might benefit from the official linter running on a public CI.

This is derived from the ansible community collection skeleton/repo template project that I contribute to: https://github.com/ansible-collections/collection_template. It also relies on a GitHub Action for invoking ansible-test that I maintain in the Ansible Community GH org.

Type of change

• [x] Testing / Maintenance

How Has This Been Tested?

CI

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Any dependent changes have been merged and published in downstream modules
• [x] Any variable changes have been validated to be backwards compatible