The idea is that I'd like to be able to document the mirror stack so that it "just works" out of the box so people interested in setting up a mirror can test it.
For this, we need a small kafka server with some data in it (say one or 2 small gitab/gitea ingested instances) that is publicly available. Only anonymized topics should be accessible there.
For the content-replayer to work, it will also need an objectstorage, since the content replayer pulls blobs from one objstorage to another (reading sha1s from the content topic).
This might be a bit trickier if we want to make it "read-only" to prevent kiddies from playing with it...
 the ReadObjStorageFilter is our friend here[/edit]
It might also be useful to have the kafka accessible with and without authentication (to test that authentication layer), but it's not that important.