Make public/ folder configurable via env

[razvanphp]

Describe you feature request

We tried frankenphp official docker image with Yii2 framework, but our public folder is called web instead of public.

Can we make this configurable via some ENV variable in the official image?

I could probably override it in my own Dockerfile and Caddyfile, but it would be beneficial for other users too.

Thank you for this great piece of software! R

[razvanphp]

https://github.com/dunglas/frankenphp/blob/12fb11eeaddb0ff63fc8e521c296659d54a83542/caddy/frankenphp/Caddyfile#L31

Maybe we could change it to root * {$SERVER_ROOT:public/} ?

[dunglas]

Wouldn't it be better to override the Caddyfile in a custom stage?

[razvanphp]

Indeed, but it would be nice to have one-liner working with the official docker image for local development.

Should be backwards compatible as the default will still be public/

[dunglas]

Ok, why not!

Do you want to open a PR?