Add an action to update jails automatically.

I probably will only use this for end-user systems like a laptop but not for servers so I can pick when I need to reboot my servers.

migrations/01_init.sql

@@ -5,6 +5,13 @@ CREATE TABLE IF NOT EXISTS global_action (
        next_run INTEGER DEFAULT 0 NOT NULL
 );
 
+CREATE TABLE IF NOT EXISTS jail_action (
+       name TEXT NOT NULL,
+       jail_name TEXT NOT NULL,
+       next_run INTEGER DEFAULT 0 NOT NULL,
+       PRIMARY KEY (name, jail_name)
+);
+
 CREATE TABLE IF NOT EXISTS local_action (
        name TEXT NOT NULL,
        jail_name TEXT NOT NULL,