Stay with PG12, upgrade not successful :(

docker-compose.yml

@@ -41,7 +41,7 @@ services:
     restart: unless-stopped
 
   mattermost-db:
-    image: postgres:13-alpine
+    image: postgres:12-alpine
     container_name: mattermost-db
     volumes:
       - mattermost-db:/var/lib/postgresql/data