mpd-discord-rpc: init service

[Kranzes]

Description

This PR adds a configurable service that runs mpd-discord-rpc.

I am waiting for the upstream package to merge this pull request JakeStanger/mpd-discord-rpc#16 so the package can be added to nixpkgs.

The module has also been tested to be working fine on my personal system with an overlay for the package mpd-discord-rpc since it is not in nixpkgs yet. ,it is now.

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

  • Added myself and the module files to .github/CODEOWNERS.

[berbiche]

Thanks, I left some comments until you mark the PR as ready.

[sumnerevans]

Probably also need to rebase to get the latest fixes to the nnn tests.

[Kranzes]

Drafting the PR because there has been some changes to the package that I am implementing now.

[Kranzes]

Alright I have tested the new changes and they work, I think it's fine to merge this before the new update that support the new options is merged into nixpkgs. It does not error when using an outdated version. NixOS/nixpkgs#161350 merged.

[Kranzes]

Re-adjusted the settings option to work nicer with the new changes in the latest release. Drafting until NixOS/nixpkgs#161510 reaches unstable.

[Kranzes]

The update hit the nixos-unstable, undrafting.

[berbiche]

Thanks for the PR!

[berbiche]

LGTM!

Thanks again and sorry for the delay.