Update github-actions.md
Update github-actions.md

Included 'Check Out Repo' step, to solve the the issue  https://github.com/docker/docker.github.io/issues/11718#issue-738387923
docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io