Move SQLite extension loading to config/runtime.exs

Addresses deprecation mentioned at https://hexdocs.pm/ecto/Ecto.Repo.html#c:init/2

config/runtime.exs

@@ -28,6 +28,11 @@ if user = System.get_env("LAST_FM_USER") do
   config :music_library, LastFm, user: user
 end
 
+config :music_library, MusicLibrary.Repo,
+  load_extensions: [
+    MusicLibrary.Repo.extension_path("unicode")
+  ]
+
 if config_env() == :prod do
   database_path =
     System.get_env("DATABASE_PATH") ||

lib/music_library/repo.ex

@@ -3,13 +3,6 @@ defmodule MusicLibrary.Repo do
     otp_app: :music_library,
     adapter: Ecto.Adapters.SQLite3
 
-  def init(_context, config) do
-    {:ok,
-     Keyword.put(config, :load_extensions, [
-       extension_path("unicode")
-     ])}
-  end
-
   def extension_path(name) do
     [arch | _rest] =
       :erlang.system_info(:system_architecture)

test/music_library/repo_test.exs

@@ -1,5 +1,4 @@
 defmodule MusicLibrary.RepoTest do
-  alias MusicLibrary.ReleaseGroupsFixtures
   use MusicLibrary.DataCase
 
   describe "correctly loads the unicode extension" do