fix find permission error in build.sh

build.sh

@@ -21,7 +21,7 @@ get_docker_run_flags() {
         if [ -t 0 ]; then
             DOCKER_RUN_FLAGS+=(--tty)
         fi
-        USB_SERIAL_DEVICES=$(find /dev -name 'ttyUSB0' -o -name 'ttyACM*')
+        USB_SERIAL_DEVICES=$(find /dev -name 'ttyUSB0' -o -name 'ttyACM*' || true)
         for device in $USB_SERIAL_DEVICES; do
             DOCKER_RUN_FLAGS+=(--device "$device")
             echo_status "Adding device $device to container"