Update docker-compose.yaml to support plugins

[mikaabra]

This adds the volumes mount needed for plugins to work

[Kolbi]

Thank you, was already planning to do it. :)

Portainer Docker compose: `services: deye-mqtt: image: ghcr.io/kbialek/deye-inverter-mqtt env_file:

• stack.env restart: unless-stopped volumes:
• plugins:/opt/deye_inverter_mqtt/plugins:ro

volumes: plugins:`

Is there any possibility to update the plugins with starting the docker container?