Add GitHub Actions self hosted runner Dev container

[Pwd9000-ML]

This addition will allow to create a basic codespace that also acts as a self hosted runner.
Community contribution is based on my blog: Hosting your self hosted runners on GitHub Codespaces

[ghost]

All CLA requirements met.

[bamurtaugh]

Thanks for opening @Pwd9000-ML!

Our team has been actively focused on an updated plan for community contributions and this repo moving forward, which we've now outlined in this issue: #1589. This includes moving to a couple new repos for images (https://github.com/devcontainers/images) and Features (https://github.com/devcontainers/features).

We anticipate to have a similar repo and distribution process for templates/definitions like yours. We'll keep everyone updated (likely via another issue in this repo or comment on #1589) when our new templates repo is available and the process is defined.

Please let me know if you have any questions, thank you!

[Pwd9000-ML]

@bamurtaugh Thank you,
I am in the process of moving my devcontainer templates onto the new process and will close this PR once completed and tested.
Thank you so much!

[Pwd9000-ML]

@bamurtaugh
Closing the pull request as I have now read and migrated my devcontainer to the new process and awaiting approvals there.