Gitlab CI/CD support

Gitlab CI/CD documentation is no longer maintained

While it is perfectly possible to implement MACH composer in a Gitlab CI/CD pipeline, we will not be updating its documentation anymore, as GitHub Actions seems to be the preferred CI/CD solution for most of our users.

For a current implementation of a GitHub CI/CD flow, please see the GitHub CI/CD documentation of MACH composer.

For the old, outdated Gitlab CI/CD documentation, click here.