* Adds RUNNER_GROUP argument to the runner registration
Adds the ability to register a runner to a predefined runner_group
Resolves#137
* Update README with runner group example
- Updates the README with instructions of how to add the runner to a
group
- Fix code fencing for shell and yaml blocks in the README
- Use consistent bullet points (dash not asterisk)
* Use self update ready entrypoint
* Add --once support for runsvc.sh
Run `cd runner; NAME=$DOCKER_USER/actions-runner TAG=dev make docker-build docker-push`,
`kubectl apply -f release/actions-runner-controller.yaml`,
then update the runner image(not the controller image) by updating e.g. `Runner.Spec.Image` to `$DOCKER_USER/actions-runner:$TAG`, for testing.
Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>