Add gitlab configuration

[sbilello]

Please add documentation on how to use rover with Gitlab

https://www.apollographql.com/docs/rover/ci-cd/

[JakeDawkins]

@sbilello have you already set up Gitlab to use Rover and have something to share already that we can build off? I've never used Gitlab for CI and am just curious 😄

[sbilello]

No! I didn't :) We use it in our CI/CD pipeline GitLab so I was trying to get this information to share with my infra team! Maybe you can spin up a docker container with gitlab https://docs.gitlab.com/omnibus/docker/

[EverlastingBugstopper]

fixed by #1513