I have written scripts for automatic creation and and renewal of LetsEncrypt certificates (incl. wildcard certificates).
I thought somebody else would find this useful:
https://github.com/aney1/certbot-domainvalidation-dynu

This repository contains everything needed to create and renew LetsEncrypt certificates (incl. wildcard certificates) on Dynu (https://www.dynu.com/). This should work on every machine that can run docker (I'm using it on a QNAP NAS). If you already have certbot installed you can also just use the scripts in the scripts folder, without docker.