Set instance static/uploads to be outside of application directory in release config

In case of releases the application directory changes with each version
so the contents will not be accessible

config/releases.exs

@@ -1,5 +1,8 @@
 import Config
 
+config :pleroma, :instance, static_dir: "/var/lib/pleroma/static"
+config :pleroma, Pleroma.Uploaders.Local, uploads: "/var/lib/pleroma/uploads"
+
 config_path = System.get_env("PLEROMA_CONFIG_PATH") || "/etc/pleroma/config.exs"
 
 if File.exists?(config_path) do