Remotely build, fetch and flash
usage: fx flash-remote HOST [DIR] [--no-flash] [--no-build]
Connect to HOST, run a build using fx from DIR, fetch the artifacts and
start the flash.
--no-build do not build, just pull artifacts already present
--no-flash do not start the fastboot, just pull the artifacts
-s Serial of device you wish to flash to (only necessary if multiple
devices in fastboot mode)
HOST the hostname to connect to
DIR defaults to ~/fuchsia, the path to the FUCHSIA_DIR on HOST