Update database automatically in Docker

Applying the migrations scripts by hand in Docker is not that easy and most people expect this to automatically happen.

docker-compose.yml

@@ -20,6 +20,7 @@ services:
       # Adapted from ./config/config.yml
       INVIDIOUS_CONFIG: |
         channel_threads: 1
+        check_tables: true
         feed_threads: 1
         db:
           user: kemal