I used livebook 0.12.1 on fly previously, using the approach set out here: Deploy Livebook on Fly.io · Fly Docs

But now, trying the same approach with the latest version of livebook, I get an error in the UI whenever I try to execute a cell:

Connecting runtime failed - Elixir terminated unexpectedly, please check your logs for errors. Reason: normal

Any ideas what I might be missing? This is my fly.toml:

[build]
  image = 'ghcr.io/livebook-dev/livebook'

[env]
  ELIXIR_ERL_OPTIONS = '-proto_dist inet6_tcp'
  LIVEBOOK_DATA_PATH = '/data'
  LIVEBOOK_HOME = '/data'
  LIVEBOOK_IP = '::'
  LIVEBOOK_ROOT_PATH = '/data'
  PORT = '8080'

[[mounts]]
  source = 'data'
  destination = '/data'
  initial_size = '10gb'

[http_service]
  internal_port = 8080
  force_https = true
  auto_stop_machines = 'off'
  auto_start_machines = false
  min_machines_running = 0
  processes = ['app']

[[vm]]
  memory = '1gb'
  cpu_kind = 'shared'
  cpus = 1