With a new release 0.9.0, arm build is finally available. It is not a big deal to properly install it following instructions, but problem is with exposing your instance to the internet, bc of 2 open ports requirement (1235 for ui and 8536 for a server). I have tried to use tunneling services like ngrok and pagekite to expose localhost on 1235 port, but in this case I got access to ui only without ability to execute any action.
Have you managed to successfully expose your instance? How?
If you handle SSL elsewhere, then you can remove anything related to SSL from the nginx config (and also the first server block which redirects from http to https).