The Grafana Image Renderer server as an Pterodactyl egg. Combined with the official Grafana egg, you Grafana instance can render images.
Just import the .json in the Nests section of Pterodactyl.
The Dockerfile is available here: DockerHub
Update your Grafana configuration to point to the right locations:
[rendering]
server_url = http://localhost:8081/render
callback_url = http://localhost:3000/
Replace http://localhost:8081/render with the address of your image renderer and http://localhost:3000/ with the address of your
Grafana instance. These settings have to be changed in your Grafanas defaults.ini (or grafana.ini).
The Grafana Image Renderer does not have any protection by default. It is strongly recommended to have a proper firewall setup on your server that restricts access to this application to trusted hosts.