Can't find PHP Executable when using a remote CLI Interpreter from docker-compose

Hello,

I was following this guide on Configuring Remote PHP Interpreters and I'm having some problems when it comes to finding the PHP executable inside my docker container.

These are my settings:

I've also tried with the default "php" path under "PHP executable" and got the same result :/

And when I go the the Services tab and check the files of the container, I can see that php is there:

And this is my docker-compose.yaml:

And the Dockerfile that its building:

And If I add the remote interpreter from Docker (instead of docker-compose), it works normally :(

What am I missing here?

Using PhpStorm 2019.3