rake: add meta.mainProgram

+1
+1
pkgs/development/tools/build-managers/rake/default.nix
··· 13 license = with licenses; mit; 14 maintainers = with maintainers; [ manveru nicknovitski ]; 15 platforms = platforms.unix; 16 }; 17 }
··· 13 license = with licenses; mit; 14 maintainers = with maintainers; [ manveru nicknovitski ]; 15 platforms = platforms.unix; 16 + mainProgram = "rake"; 17 }; 18 }