COOKIE_SECRET is now a Docker secret, and several config options have been
dropped from the recipe -- this shouldn't affect running deplyoments, as
the recipe currently just installs the generated `config.json` if there isn't
one already -- but you will likely still need to run 
`abra app secret generate ...` before deploying, in preparation for moving to
ennvironment variables for config in a future release.

Additionally, there is now a healthcheck, which may require tuning, especially
on slower systems; please open a ticket on [the issue
tracker](https://git.coopcloud.tech/coop-cloud/federatedwiki/issues) if you
notice problems with the containers starting up.