Use PORT instead of UPAAS_PORT for listen port

README.md

@@ -156,7 +156,7 @@ Environment variables:
 
 | Variable | Description | Default |
 |----------|-------------|---------|
-| `UPAAS_PORT` | HTTP listen port | 8080 |
+| `PORT` | HTTP listen port | 8080 |
 | `UPAAS_DATA_DIR` | Data directory for SQLite and keys | ./data |
 | `UPAAS_DOCKER_HOST` | Docker socket path | unix:///var/run/docker.sock |
 | `DEBUG` | Enable debug logging | false |