Add Apple arm support for node install script

dot_local/share/buddy-up/includes/node.sh

@@ -16,14 +16,15 @@ node_current () (
 
 get_arch () (
     case $(uname -m) in
-        x86_64*)    echo x64;;
+        x86_64*)    echo x64 ;;
-        amd64*)     echo x64;;
+        amd64*)     echo x64 ;;
-        arm)        echo armv7l;;
+        arm)        echo armv7l ;;
-        armv7*)     echo armv7l;;
+        arm64)      echo arm64 ;;
-        armv6*)     echo armv7l;;
+        armv7*)     echo armv7l ;;
-        armv8*)     echo arm64;;
+        armv6*)     echo armv7l ;;
-        aarch64*)   echo arm64;;
+        armv8*)     echo arm64 ;;
-        *)          >&2 echo "unsupported architecture: $(uname -m)"; exit 1;;
+        aarch64*)   echo arm64 ;;
+        *)          >&2 echo "unsupported architecture: $(uname -m)"; exit 1 ;;
     esac
 )