Could we use a single container for scale-set runners?

[mattpopa]

The current design requires init container, runner and dind (in case of dind).

For dind use-case, can we only use a custom runner+dind, to have a single image? This would be much better for resource efficiency, and setting limits for a single container.

It would also mitigate transient failures like these when the node has some load

Checking docker version
  /usr/bin/docker version --format '{{.Server.APIVersion}}'
  Cannot connect to the Docker daemon at unix:///run/docker/docker.sock. Is the docker daemon running?
  '
  Error: Exit code 1 returned from process: file name '/usr/bin/docker', arguments 'version --format '{{.Server.APIVersion}}''.

Did anyone uses a single image for runners (dind scoped)?