Move db_pull task under prod namespace

lib/mix/tasks/music_library/prod/db_pull.ex

@@ -0,0 +1,34 @@
+defmodule Mix.Tasks.MusicLibrary.Prod.DbPull do
+  use Mix.Task
+  @shortdoc "Pulls the latest database from the production server"
+  @moduledoc """
+  Pulls the latest database from the production server.
+
+  Requires the `flyctl` CLI to be installed and authenticated.
+  """
+
+  @impl Mix.Task
+  def run(_args) do
+    IO.puts("Pulling the latest database from the production server")
+
+    current_time = DateTime.utc_now()
+    remote_db = "/mnt/music_library/music_library_prod.db"
+    local_db = "data/music_library_prod_#{DateTime.to_unix(current_time)}.db"
+
+    case System.cmd("flyctl", ["ssh", "sftp", "get", remote_db, local_db], into: IO.stream()) do
+      {_stream, 1} ->
+        IO.puts("Failed to pull the database")
+        System.halt(1)
+
+      {_stream, 0} ->
+        IO.puts("Database pulled successfully")
+
+        IO.puts("Restoring as local dev database")
+
+        Path.wildcard("data/music_library_dev.db*")
+        |> Enum.each(&File.rm!/1)
+
+        File.cp!(local_db, "data/music_library_dev.db")
+    end
+  end
+end