Hmm yea with a self hosted runner this could work. Gotta need to set the dockerd config into the VM before the runner starts I assume - unfortunately GitHub itself does not allow to change anything for the prepare stage - and it's a known issue for 2 years at least...
https://github.com/actions/runner-images/issues/1445#issueco... https://github.com/orgs/community/discussions/76636