Enable Grafana Image Renderer Service

[mgorovoy]

I'm trying to export the dashboard as image. Grafana shows error message that says "image renderer is not installed". I followed the instructions to add it to Docker by adding the following section to compose.yml

grafana-renderer:
restart: always
image: grafana/grafana-image-renderer:latest
container_name: netprobe-grafana-renderer
volumes:
- grafana_data:/var/lib/grafana/renderer
ports:
- '8081:8081'
networks:
- netprobe-net
dns:
- 8.8.8.8
- 8.8.4.4

However, the next step in the instructions is to add the following configuration to grafana.ini file. How can I do that while running Grafana using their Docker image?

[rendering]
server_url = http://localhost:8081/render
callback_url = http://localhost:3000/