Docker-In-Docker support by Default

[wethinkagile]

Is your feature request related to a problem? Please describe.

We need docker in docker, of course!

Describe the solution you'd like

docker daemon should be available by default

Describe alternatives you've considered

building own image

Additional context

[Olgoetz]

I am facing the same requirement.
When trying to build my own image, I always encounter:

systemctl start docker
System has not been booted with systemd as init system (PID 1). Can't operate.

[nashafa]

Having support on the base runner (or even separate runner) would be great! Currently, the base runner doesn't support using the standard GitHub Actions syntax for running jobs within a container.

What would building a custom image to support this look like? I took a stab at this briefly myself but encountered similar issues to @Olgoetz since we need Docker to be available once the container is running.

Should this be as simple as the following, alternatively installing directly from a package?

FROM quay.io/redhat-github-actions/runner:latest

USER root
RUN dnf -y install dnf-plugins-core
RUN dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
RUN dnf -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
USER $UID