THIS IS A TEST INSTANCE ONLY! REPOSITORIES CAN BE DELETED AT ANY TIME!

Support basic, dind and dind-rootless as multiple kinds of images (#619)

- `basic`: Only the runner process in the container; users need to mount the Docker socket to it.
- `dind`: A Docker daemon will be started in the container with the root user.
- `dind-rootless`: A Docker daemon will be started in the container with a rootless user.

Use s6 instead of supervisord to start processes.

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/619
Reviewed-by: Zettat123 <zettat123@noreply.gitea.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>
Co-committed-by: Jason Song <i@wolfogre.com>
This commit was merged in pull request #619.
This commit is contained in:
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Gitea Version: 1.28.0+dev-528-ga5a645824f