error Command "start" not found

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Here is my fly.toml

# fly.toml app configuration file generated for summer-cloud-9028 on 2023-05-11T14:52:41+02:00
#
# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
#

app = "[hidden]"
kill_signal = "SIGINT"
kill_timeout = 5
processes = []

[build]
  builder = "heroku/buildpacks:20"

[env]
  NODE_ENV = "production"
  PORT = "8080"
  # The following ENVs are not listed here because they are registered as secrets:
  # MYSQL_HOST
  # MYSQL_PORT
  # MYSQL_DATABASE
  # MYSQL_USER
  # MYSQL_PASSWORD

[deploy]
  release_command = "yarn knex migrate:latest"

[experimental]
  allowed_public_ports = []
  auto_rollback = true

[[services]]
  http_checks = []
  internal_port = 8080
  processes = ["app"]
  protocol = "tcp"
  script_checks = []
  [services.concurrency]
    hard_limit = 25
    soft_limit = 20
    type = "connections"

  [[services.ports]]
    force_https = true
    handlers = ["http"]
    port = 80

  [[services.ports]]
    handlers = ["tls", "http"]
    port = 443

  [[services.tcp_checks]]
    grace_period = "1s"
    interval = "15s"
    restart_limit = 0
    timeout = "2s"