Cannot set custom kamal proxy error pages

[ahmayou]

Kamal Proxy allows setting custom error pages in: Kamal Proxy PR #12
However, when setting this in kamal deploy under proxy as specified here it throws an error:

proxy:
  ssl: true
  hosts: 
    - example.com
    - www.example.com
  error_pages_path: /usr/local/share/errors/myservice

ERROR (Kamal::ConfigurationError): proxy: unknown key: error_page_path

[pokonski]

kamal-proxy is not kamal, this error_page_path attribute is not exposed in Kamal config (yet?)