acme-client is no longer in the repos - looks like its been replaced with acmetool. I assume by the same author? I'm nowhere near experienced enough to refactor this page BUT the user guide (hlandau.github.io/acme/userguide) is pretty good, you set it up like so:
- acmetool quickstart
- acmetool want example.com voidlinux.org
(With your domains, d'uh!) is a great way to get going - I found the proxy version worked quite well with just a few adjustments from the guides here. Hopefully someone with experience will fix this up. Alpine/nGinX is a blazing fast way to proxy HTTP/HTTPS to my hodge-podge of servers.