gitlab bible
https://docs.gitlab.com/runner/install/linux-manually.html
sudo curl -L --output /usr/local/bin/gitlab-runner https://gitlab-runner-downloads.s3.amazonaws.com/latest/binaries/gitlab-runner-linux-amd64
https://docs.gitlab.com/runner/register/
sudo gitlab-runner register \
--non-interactive \
--url "https://gitlab.com/" \
--registration-token "<token>" \
--executor "docker" \
--docker-image docker:19.03.1 \
--description "description" \
--tag-list "<tag>" \
--run-untagged="true" \
--locked="false" \
--access-level="not_protected" \
--docker-volumes /var/run/docker.sock:/var/run/docker.sock