ci: add gh action workflow for F5 CLA automation

[TasoOneAsia]

Proposed changes

Adds a GitHub actions workflow configured for F5 contributor license agreement automation and compliance. This action is configured to target a shared signature store for F5 Open Source projects. As part of the configuration, the following GitHub usernames were whitelisted as maintainers:

• oxpa
• alessfg

Any contributors not included in this whitelist will be asked to review the F5 CLA, upon a pull request, and post a comment agreeing to the terms before their contribution is merged.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• [x] I have read the CONTRIBUTING document.
• [x] I have added Molecule tests that prove my fix is effective or that my feature works.
• [x] I have checked that any relevant Molecule tests pass after adding my changes.
• [x] I have updated any relevant documentation (defaults/main/*.yml, README.md and CHANGELOG.md).