fix: restore env defaults for portainer UI parsing

docker-compose.yml

@@ -7,8 +7,8 @@ services:
       - "3000:3000"
     environment:
       - NODE_ENV=production
-      - DATABASE_URL=${DATABASE_URL}
-      - SESSION_SECRET=${SESSION_SECRET}
+      - DATABASE_URL=${DATABASE_URL:-postgresql://user:password@host:5432/database?schema=public}
+      - SESSION_SECRET=${SESSION_SECRET:-your_secret_key_here}
     deploy:
       mode: replicated
       replicas: 1