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 broker client and server, to make upgrading them independently of Elixir easier and to allow them to have a separate memory space.
One can call the broker client with (e.g.)
broker broker:1500 execute-command -- file --mime-type -b image.png
; this translation is directly integrated into the app, replacingSystem.cmd/2
where it previously appeared for media processing.If you are not deploying using docker, broker should exist in PATH for the application, and you should compile broker_server and run it as a systemd service.