Use GPU acceleration on Puppeteer

[mayailurus]

@renderer

[[services]]
  protocol = 'udp'
  internal_port = 3478
  auto_start_machines = false
  ports = []

As a side tip, unrelated to GPUs, try running fly config validate --strict whenever you encounter puzzling behavior on the Fly.io platform.

(flyctl doesn’t automatically complain about some syntactic and logical errors.)