Symfony 4 | Custom configuration file : I have been searching for a little while but I cannot find anything useful (or at least I think so).
My goal is to add to a new symfony 4.4 project an extra config file to define some behavior of the system, it could be anything, like, pancakes.yaml:
```yaml
pancakes:
    enablePancakes: false
```

I wish to know how can I load that config file, find a way to read its parameters and values to change some custom behavior the system might have but honestly I think I'm not smart enough to undestand what the documentation says.

For now it could be anything, like printing the config file values, idk, for now I only need to know how to load it.

Any tip or help would be a great help for me, I'm kinda lost here