cosmic: add module

[HeitorAugustoLN]

Description

Adds a new module, wayland.desktopManager.cosmic, is now available for configuring the COSMIC desktop environment. This module allows you to manage COSMIC components, configuration files, and reset the desktop to a known state.

This pull request upstreams the core functionality from cosmic-manager. The rest of the modules will remain in the cosmic-manager repository, as they would be better off maintained out-of-tree

Depends on NixOS/nixpkgs#440544 and NixOS/nixpkgs#442207

Checklist

• Change is backwards compatible.

• Code formatted with nix fmt or
  nix-shell -p treefmt nixfmt deadnix keep-sorted --run treefmt.

• Code tested through nix run .#tests -- test-all or
  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.
  • Generate a news entry. See News
  • Basic tests added. See Tests

• If this PR adds an exciting new feature or contains a breaking change.

  • Generate a news entry. See News

[khaneliman]

Nice, been meaning to try cosmic out sometime on my son's desktop. This would make it easier.

[Yethal]

@HeitorAugustoLN Shouldn't this include systemd integration and xdg portal config like the hyprland module does?

[HeitorAugustoLN]

Shouldn't this include systemd integration and xdg portal config like the hyprland module does?

No, this module is not for COSMIC installation, only for configuration, unlike the hyprland one, it is not possible to install COSMIC with home-manager

[stale]

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[khaneliman]

@HeitorAugustoLN still waiting on the ron generator for this?

[HeitorAugustoLN]

@HeitorAugustoLN still waiting on the ron generator for this?

Yes