Pull out media server and handling into separate container #389
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This PR changes Philomena to call image processing tools with an RPC client and server, to make upgrading them independently of Elixir easier and to allow them to have a separate memory space.
Calling the remote server is directly integrated into the app, replacing
System.cmd/2
where it previously appeared for media processing. A standalone client utility is included but not compiled by default; using it, one can call the RPC server with (e.g.)mediaproc_client mediaproc:1500 execute-command -- file --mime-type -b image.png
If you are not deploying using docker, you should compile mediaproc_server and run it as a systemd service.