Motivation for this change

Caprine is a third-party Facebook messenger client with a beautiful UI and features to enhance the privacy of users.
As an NodeJS-Electron application, the build-from-source attempt suffer from NPM trying to download Electron at build time, and the binary build can serve as a workaround.

Update:
Closes #90375

Known issue

Crash when doing things involving "open files with file manager", complaining:

WARNING: Kernel has no file descriptor comparison support: Function not implemented

(caprine:22216): GLib-GIO-ERROR **: 05:53:43.885: No GSettings schemas are installed on the system
Trace/breakpoint trap (core dumped)

Tried adding some Gnome-related packages to extraPagkages, but it doesn't solve the problem. It has been mentioned on NixOS Discourse.

This is common on AppImages, and is also happen when executing using appimage-run.

Nevertheless, drag-and-drop of files still work, which can serve as a workaround to the problem above.

Solved after referencing dtzWill's work on minetime and add

appimageTools.wrapType2 {
# ...
  profile = ''
    export LC_ALL=C.UTF-8
    export XDG_DATA_DIRS=${gsettings-desktop-schemas}/share/gsettings-schemas/${gsettings-desktop-schemas.name}:${gtk3}/share/gsettings-schemas/${gtk3.name}:$XDG_DATA_DIRS
  '';
# ...
}

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/) (The binary build from AppImage works. I don't have Mac with me, so I cannot test the dmg part.)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.