feat(ux): avoid starting bitcoin-qt if DISPLAY is unset (#1327)

nodebuilder

@@ -1410,6 +1410,7 @@ esac
 log_info 'Starting Bitcoin Core.'
 if is_running_in_ci ||
   is_running_in_container ||
+  [ -z "${DISPLAY}" ] ||
   ! command -v bitcoin-qt > /dev/null 2>&1; then
   bitcoind --daemonwait > /dev/null
 elif [ "${TARGET_KERNEL}" = 'Darwin' ]; then