add firmware branch build

firmware_branch/cros_reposync_firmware.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# TODO: maybe to umount and remove old ToT?
+# Or `cros_sdk --delete` enough ?
+
+SCRIPT_DIR=/home/casperchang/chrome/daily_routine_repo/firmware_branch
+WORKING_DIR=/home/casperchang/chrome/dailyBuild_firmware
+# WORKING_DIR=/home/casperchang/chrome/ToT
+
+cd ${WORKING_DIR}
+repo sync