doom-emacs VS emacs-config

You can take a look at the default init.el file for Doom emacs here, as you can see, there is a :lang section where you can uncomment support for commonly used languages. Although you generally don't change the init.el file too much, usually, it is there to load your actual config files. If your language is not supported out of the box, there are ways to add packages (a.k.a. "plug-ins") in packages.el. And you can add customizations in config.el.

As a heads up this is not OP's config, but I believe the github repo related to this config https://github.com/tecosaur/emacs-config may hold it

With doom you have the option to stay close to its defaults (e.g. henriks config: https://github.com/hlissner/doom-emacs-private/blob/master/config.el), extend and configure doom emacs (e.g. tecosaurs config: https://github.com/tecosaur/emacs-config) or build off it and make it your own (e.g. https://github.com/shaunsingh/nyoom.emacs shameless plug)

It seems u/tecosaur has been able to use Github Actions to generate HTML/PDF on export. Though his setup seems to be "involved" :/

The emacs-config of tecosaur (https://github.com/tecosaur/emacs-config) is used with the recent Doom.

Link to my config repo

This config has a section on using emacs as a systemd service. I haven't tried it personally, but it may be helpful for you.

Thanks! Like many nice things, I am profiting off someone else's nice work here 😁. You can find it in my config repo. Feel absolutely free to reuse/modify it (it's what I've done after all)!