cd: add linux_arm platform

Author: KRTirtho

cli/commands/build.dart

@@ -3,6 +3,7 @@ import 'package:args/command_runner.dart';
 import 'build/android.dart';
 import 'build/ios.dart';
 import 'build/linux.dart';
+import 'build/linux_arm.dart';
 import 'build/macos.dart';
 import 'build/windows.dart';
 
@@ -17,6 +18,7 @@ class BuildCommand extends Command {
     addSubcommand(AndroidBuildCommand());
     addSubcommand(IosBuildCommand());
     addSubcommand(LinuxBuildCommand());
+    addSubcommand(LinuxArmBuildCommand());
     addSubcommand(MacosBuildCommand());
     addSubcommand(WindowsBuildCommand());
   }