Update UI and migrations, fix dockerfile

db/migrations/033_tg_reactor_since.sql

@@ -0,0 +1,4 @@
+INSERT INTO app_settings(key, value_json, value_type, title, description, category)
+VALUES
+  ('tg_reactor_since', '""'::jsonb, 'str', 'React only since', 'UTC ISO timestamp. If set, TG reactor ignores publications older than this moment.', 'TG Reactor')
+ON CONFLICT (key) DO NOTHING;