Acme.sh is a pure Unix shell script implementing the ACME client protocol.
Installation
Setup
The installation does pretty much everything, including setting up a cron job so no more work is needed.
Issue certificates
It is as simple as running doas /usr/local/acme.sh/acme.sh --issue -d -w .
Then for more domains or SANs, just add more -d options with its arguments to the command line