qgis: MIME types are missing

[AndrewKvalheim]

Describe the bug

QGIS defines several MIME types such as application/x-qgis-project and application/x-esri-shape, but these are missing in NixOS.

Steps To Reproduce

1. Install QGIS:

   environment.systemPackages = [ pkgs.qgis ];

2. Acquire a sample QGIS file:

   wget 'https://github.com/qgis/QGIS/raw/refs/tags/final-3_36_3/tests/testdata/projects/good_layers_test.qgs'

3. Query its MIME type:

   $ xdg-mime query filetype 'good_layers_test.qgs'
   text/html

Expected behavior

Compare with Ubuntu:

$ podman run --rm --interactive --tty ubuntu:24.04 bash
# apt update && apt install qgis wget xdg-utils
# wget 'https://github.com/qgis/QGIS/raw/refs/tags/final-3_36_3/tests/testdata/projects/good_layers_test.qgs'
# xdg-mime query filetype 'good_layers_test.qgs'
application/x-qgis-layer-settings

Additional context

The practical impact of this is that QGIS projects open in the wrong application.

Metadata

$ nix-shell --packages 'nix-info' --run 'nix-info --markdown'
 - system: `"x86_64-linux"`
 - host os: `Linux 6.11.7, NixOS, 24.05 (Uakari), 24.05.6565.689fed12a013`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.8`
 - channels(root): `"nix-math, nixos-24.05, nixos-hardware, nixseparatedebuginfod"`
 - channels(user): `"community-vscode-extensions, home-manager-23.11.tar.gz, nix-colors, rust-overlay, unstable"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

Notify maintainers

@NixOS/geospatial @lsix

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