treewide: add meta.mainProgram (#251487)

* skhd: add meta.mainProgram

* yabai: add meta.mainProgram

* kitty: add meta.mainProgram

* alacritty: add meta.mainProgram

* thunar: add meta.mainProgram

* looking-glass-client: add meta.mainProgram

* thunderbird: add meta.mainProgram

* ckb-next: add meta.mainProgram

* virt-manager: add meta.mainProgram

* gh: add meta.mainProgram

pkgs/applications/networking/mailreaders/thunderbird/packages.nix

···
       changelog = "https://www.thunderbird.net/en-US/thunderbird/${version}/releasenotes/";
       description = "A full-featured e-mail client";
       homepage = "https://thunderbird.net/";
+      mainProgram = "thunderbird";
       maintainers = with maintainers; [ eelco lovesegfault pierron vcunat ];
       platforms = platforms.unix;
       badPlatforms = platforms.darwin;
···
       changelog = "https://www.thunderbird.net/en-US/thunderbird/${version}/releasenotes/";
       description = "A full-featured e-mail client";
       homepage = "https://thunderbird.net/";
+      mainProgram = "thunderbird";
       maintainers = with maintainers; [ eelco lovesegfault pierron vcunat ];
       platforms = platforms.unix;
       badPlatforms = platforms.darwin;

pkgs/applications/terminal-emulators/alacritty/default.nix

···
     description = "A cross-platform, GPU-accelerated terminal emulator";
     homepage = "https://github.com/alacritty/alacritty";
     license = licenses.asl20;
+    mainProgram = "alacritty";
     maintainers = with maintainers; [ Br1ght0ne mic92 ];
     platforms = platforms.unix;
     changelog = "https://github.com/alacritty/alacritty/blob/v${version}/CHANGELOG.md";

pkgs/applications/terminal-emulators/kitty/default.nix

···
     license = licenses.gpl3Only;
     changelog = "https://sw.kovidgoyal.net/kitty/changelog/";
     platforms = platforms.darwin ++ platforms.linux;
+    mainProgram = "kitty";
     maintainers = with maintainers; [ tex rvolosatovs Luflosi adamcstephens ];
   };
 }

pkgs/applications/version-management/gh/default.nix

···
     homepage = "https://cli.github.com/";
     changelog = "https://github.com/cli/cli/releases/tag/v${version}";
     license = licenses.mit;
+    mainProgram = "gh";
     maintainers = with maintainers; [ zowoq ];
   };
 }

pkgs/applications/virtualization/looking-glass-client/default.nix

···
     '';
     homepage = "https://looking-glass.io/";
     license = licenses.gpl2Plus;
+    mainProgram = "looking-glass-client";
     maintainers = with maintainers; [ alexbakker babbaj j-brn ];
     platforms = [ "x86_64-linux" ];
   };

pkgs/applications/virtualization/virt-manager/default.nix

···
     '';
     license = licenses.gpl2;
     platforms = platforms.unix;
+    mainProgram = "virt-manager";
     maintainers = with maintainers; [ qknight offline fpletz globin ];
   };
 }

pkgs/desktops/xfce/core/thunar/default.nix

···
 
   meta = with lib; {
     description = "Xfce file manager";
+    mainProgram = "thunar";
     maintainers = with maintainers; [ ] ++ teams.xfce.members;
   };
 };

pkgs/os-specific/darwin/skhd/default.nix

···
     description = "Simple hotkey daemon for macOS";
     homepage = "https://github.com/koekeishiya/skhd";
     license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ cmacrae lnl7 periklis khaneliman];
+    mainProgram = "skhd";
+    maintainers = with lib.maintainers; [ cmacrae lnl7 periklis khaneliman ];
     platforms = lib.platforms.darwin;
   };
 })

pkgs/os-specific/darwin/yabai/default.nix

···
     changelog = "https://github.com/koekeishiya/yabai/blob/v${version}/CHANGELOG.md";
     license = licenses.mit;
     platforms = platforms.darwin;
+    mainProgram = "yabai";
     maintainers = with maintainers; [
       cmacrae
       shardy

pkgs/tools/misc/ckb-next/default.nix

···
     homepage = "https://github.com/ckb-next/ckb-next";
     license = licenses.gpl2;
     platforms = platforms.linux;
+    mainProgram = "ckb-next";
     maintainers = with maintainers; [ ];
   };
 }