recipe: lamp: Cannot seem to get php.ini error_reporting to register, and it's unclear why

[bronius]

In the docs on https://docs.lando.dev/lamp/config.html it is clear that:

recipe: lamp
config:
  config:
    ...
    php: config/php.ini
    ...

should allow me to place php.ini in a folder ./config, and it should be read. It would be great to add to the docs how to confirm whether this is working or not: I don't see my custom php.ini file name (even when I name it more uniquely) in phpinfo(), nor do I see the value error_reporting: 1 having taken affect. I hope that with a slight addition to the official docs that I can feel more empowered to know that what whether I am entering is having the intended affect or not and whether I've implemented it correctly or not.