Add Oban for background jobs.

config/config.exs

@@ -7,6 +7,9 @@
 # General application configuration
 import Config
 
+config :ash_oban, pro?: false
+config :decentralised_book_index, Oban, plugins: [{Oban.Plugins.Cron, []}]
+
 config :mime,
   extensions: %{"json" => "application/vnd.api+json"},
   types: %{"application/vnd.api+json" => ["json"]}

config/test.exs

@@ -1,4 +1,5 @@
 import Config
+config :decentralised_book_index, Oban, testing: :manual
 config :decentralised_book_index, token_signing_secret: "k+YMBGan4wi4I3DRYRVLNVCOIDIqm+O5"
 config :ash, disable_async?: true