Update docker-compose.yml

Fix Auth

examples/bookstack/docker-compose.yml

@@ -9,8 +9,8 @@ services:
       - PGID=1000
       - APP_URL=http://127.0.0.1:8099 # change this to your prod url with https
       - DB_HOST=bookstack_db
-      - DB_USER=bookstack
-      - DB_PASS=USERPW1
+      - DB_USERNAME=bookstack
+      - DB_PASSWORD=USERPW1
       - DB_DATABASE=bookstackapp
     volumes:
       - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/bookstack/config:/config