Prod packaging v1 (#23)

* Sets media directory for prod

* Improved logging; Added docker files for prod

* Improved fetching SECRET_KEY_BASE for selfhosted instances

docker-run.dev.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -e
+
+# Ensure the app's deps are installed
+mix deps.get
+
+# Install JS deps
+echo "\nInstalling JS..."
+cd assets && yarn install
+cd ..
+
+# Potentially Set up the database
+mix ecto.create
+mix ecto.migrate
+
+# Start the phoenix web server (interactive)
+echo "\n Launching Phoenix web server..."
+iex -S mix phx.server