Fix bookstack env

Bookstack/docker-compose.yml

@@ -2,6 +2,7 @@ services:
    bookstack:
     image: lscr.io/linuxserver/bookstack:latest
     container_name: bookstack
+    env_file: .env
     environment:
       - PUID=1000
       - PGID=1000
@@ -22,6 +23,7 @@ services:
    db:
       image: "mysql:latest"
       container_name: bookstack-db
+      env_file: .env
       environment:
          - MYSQL_ROOT_PASSWORD=$DB_ROOTPASS
          - MYSQL_DATABASE=bookstackapp