[feature] enable building ARM image on x86

apps/docker-arm.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+DIR=$(readlink -f $(dirname $0))
+. $DIR/../env.sh
+
+
+# let docker be able to build arm image on x86
+if ! docker run --rm -t arm64v8/ubuntu uname -m; then
+    case "$PM" in
+        apt)
+            sudo apt-get install qemu binfmt-support qemu-user-static
+            ;;
+        pacman)
+            # TODO
+            ;;
+    esac
+    sudo docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+    sudo docker run --rm -t arm64v8/ubuntu uname -m
+fi
+