[Enhancement] Custom media lifecycle scripts (#219)

* Namespaced notification modules under lifecycle

* Added a JSON encoder for all the main model types

* Added startup task to create user script file

* Hook up user script event to media download

* Hooked up media deletion user script

* Added jq to docker deps

* Updated README

lib/pinchflat/boot/pre_job_startup_tasks.ex

@@ -33,6 +33,7 @@ defmodule Pinchflat.Boot.PreJobStartupTasks do
   def init(state) do
     reset_executing_jobs()
     create_blank_yt_dlp_files()
+    create_blank_user_script_file()
     apply_default_settings()
 
     {:ok, state}
@@ -65,6 +66,18 @@ defmodule Pinchflat.Boot.PreJobStartupTasks do
     end)
   end
 
+  defp create_blank_user_script_file do
+    base_dir = Application.get_env(:pinchflat, :extras_directory)
+    filepath = Path.join([base_dir, "user-scripts", "lifecycle"])
+
+    if !File.exists?(filepath) do
+      Logger.info("Creating blank file and making it executable: #{filepath}")
+
+      FilesystemUtils.write_p!(filepath, "")
+      File.chmod(filepath, 0o755)
+    end
+  end
+
   defp apply_default_settings do
     {:ok, yt_dlp_version} = yt_dlp_runner().version()
     {:ok, apprise_version} = apprise_runner().version()