variety: install missing desktop file

[willfish]

The 0.9.0-b1 update (#477721) moved variety from DistUtilsExtra.auto to plain setuptools + setuptools-gettext. The old build system automatically processed and installed variety.desktop.in to share/applications/, but the new setup.py only installs variety.appdata.xml via data_files — the desktop file was dropped.

This adds a postInstall step that uses intltool-merge (already in nativeBuildInputs) to process variety.desktop.in and install the resulting variety.desktop to $out/share/applications/.

Fixes the issue reported by @linsui in #477721 (comment).

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

[linsui]

The icon also needs to be installed.

[willfish]

Good catch, thanks. I've added the scalable SVG icon installation in 006b8ea. The output now has both files:

$out/share/applications/variety.desktop
$out/share/icons/hicolor/scalable/apps/variety.svg

[willfish]

Confirmed working locally

[pbsbot]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 486304
Commit: 006b8ea7accb818a0bc21bf238dc2f54abc589f8

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x86_64-linux

✅ 2 packages built:

• variety
• variety.dist