Sounds like you are looking for Opentofu/Terraform. I use Opentofu to fastly create VMs on Proxmox with Cloud Init scripts. In scenario where one VM hosts one service I try to build IaC that way I can destroy VM and create a new one without loosing anything, data nor configuration.

Not exactly. Yunohost offers solution to host services openly to the internet thanks to simplified configuration of domains (and it even offers free domains) and reverse proxy. Also it has built in email server (not client, but the server). Apps are packaged in its own format and with unique configuration, it is not just some wrapper for Docker Conpose