[QA] Document php timeouts

[jnweiger]

I've identified by nw three different timeouts, that can be configured in /etc/php/7.4/apache2/php.ini

• max_execution_time

  • defaults to 30 seconds in Ubuntu.
  • https://github.com/owncloud-ansible/php sets it to 3600
  • https://github.com/owncloud-docker/php leaves it at 30
  • https://github.com/owncloud-docker/base sets it to 3600

• max_input_time

  • defaults to 30 seconds in Ubuntu.
  • https://github.com/owncloud-ansible/php sets it to 3600
  • https://github.com/owncloud-docker/php leaves it at 30
  • https://github.com/owncloud-docker/base sets it to 3600

• default_socket_timeout

  • defaults to 60 seconds in Ubuntu.
  • https://github.com/owncloud-ansible/php sets it to 3600
  • https://github.com/owncloud-docker/php leaves it at 60
  • https://github.com/owncloud-docker/base/pull/152 sets it to 3600

The admin manual should have a section discussing recommended php settings. Maybe it already has one, and I just failed to locate it?