The staging instance was installed in T4046
The production environment can be instantiated using the same terraform components.
The gitlab installation by itself, described in hedgedoc[1], should be declined in a configuration committed in the k8s configuration repositories and applied by argocd.
The backup, not addressed in the staging environment, must be configured in a s3 compatible storage
[1] https://hedgedoc.softwareheritage.org/ynL9z-6JRnGYhW8vrLDl-w#