Prod packaging v1 (#23)

* Sets media directory for prod

* Improved logging; Added docker files for prod

* Improved fetching SECRET_KEY_BASE for selfhosted instances

lib/pinchflat/application.ex

@@ -21,6 +21,8 @@ defmodule Pinchflat.Application do
       PinchflatWeb.Endpoint
     ]
 
+    :ok = Oban.Telemetry.attach_default_logger()
+
     # See https://hexdocs.pm/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Pinchflat.Supervisor]