GitLab-CI multi runner start docker container

Question

I still don't quite understand the process for a gitlab-ci multi runner to start a docker and interact inside with the code.

Is it possible for a gitlab-ci multi runner to start a docker container having the current code inside this docker container and then run tests against this code? (e.g.: code linting)

I basically want a docker container that has various linters installed. GitLab-CI multi runner should run on the host system and start the docker container on-demand. Inside the docker container, the code should be checked against phpcs for example.

How do I get the repo code into the docker container?

Thanks for the help

Answer 1

First, gitlab-runner needs to have the Docker socket mounted as described in the documentation:

docker run -d --name gitlab-runner --restart always \
 -v /var/run/docker.sock:/var/run/docker.sock \
 -v /srv/gitlab-runner/config:/etc/gitlab-runner \
 gitlab/gitlab-runner:latest

Afterwards, you have to register the runner with:

1. docker as executor.
2. the Docker image with the linters you want as Docker image.