GitLab instances for tests purposes

For running integration tests I will setup two GitLab instances with docker on localhost and different ports.

It should not be necessary to add SSL. But if it is because some library insists on verifying the certificates, a self-signed certificate can be used:

https://lab.enough.community/fedeproxy/server/-/commit/9618664e919d686683eb6afd8a15cb3bae4f4c0e