Store Last.fm API key with encrypted secret

priv/repo/migrations/20250506085759_create_secrets.exs

@@ -0,0 +1,12 @@
+defmodule MusicLibrary.Repo.Migrations.CreateSecrets do
+  use Ecto.Migration
+
+  def change do
+    create table(:secrets, primary_key: false) do
+      add :name, :string, primary_key: true
+      add :value, :binary, null: false
+
+      timestamps()
+    end
+  end
+end