The docker-compose.yml, that orchestrates the wbregistry-01 instance of the wikibase-registry tool, is not in source control and only exists in that VM at `/root/wikibase-registry/docker-compose.yml`
We should use check this into //some// source control and usually only update it via `git pull`.
Ideally, we'd switch to managing tools like that purely declarative, but that might be out of scope.
**Acceptance criteria**
* [ ] wbregistry-01 docker-compose.yml is under source control
* [ ] the files at the instance can be updated by performing a `git pull` and some form of restart of the containers
* [ ] there is a README.md in that repo, detailing the most important steps to update wikibase-registry (to which instance one has to ssh to, where to call `git pull`, how to restart (rebuild?) the containers`)