move stop of tty service to startup script
diff --git a/bin/startup_hacks.sh b/bin/startup_hacks.sh
new file mode 100755
index 0000000..18582ae
--- /dev/null
+++ b/bin/startup_hacks.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+systemctl stop serial-getty@ttyS0
+