api_key is required to use webhooks

[v57]

Describe the bug
LiveKit server not starts when I enable webhooks with api_key and urls. It throws an error api_key is required to use webhooks. I tried different values and always getting same error. I have docker-compose and config yaml so it would be easy to reproduce

Server

• Version: 1.5.2
• Environment: Docker
• any other information about your deployment setup

To Reproduce
Here is my livekit.yaml

port: 7880
bind_addresses:
    - ""
rtc:
    tcp_port: 7881
    port_range_start: 50000
    port_range_end: 60000
    use_external_ip: false
    enable_loopback_candidate: false
redis:
    address: redis:6379
keys:
    KEY: SECRETSECRETSECRETSECRETSECRETSECRET
webhook:
  api_key: 'mywebhook'
  urls:
    - 'website.com/webhook'

And docker-compose.yaml

version: '3.8'
services:
  livekit:
    image: livekit/livekit-server:v1.5.2
    command: --config /etc/livekit.yaml
    volumes:
      - ./livekit.yaml:/etc/livekit.yaml
  redis:
    image: redis:alpine

[v57]

I see, api_key should be equal to key in keys, so setting api_key: KEY actually starts the server.
Maybe it's better to change error log to api_key name not found in provided keys