Allow users to set PHP memory limit

[michaellehmkuhl]

Description:

Commands like valet use and valet install cause /*/local/etc/php/*/conf.d/php-memory-limits.ini to be overwritten, even if it already exists. Since this config file is loaded after php.ini, the directives override what users may have set in their php.ini files. In particular, this is a problem when running an application that requires a large amount of memory (e.g., Magento), and can especially be an issue in a CLI environment, where longer running commands might be run.

As a workaround, I've taken to creating a file like /*/local/etc/php/*/conf.d/zzz-final-config.ini to ensure I can overwrite config settings as needed. This works for now, but it would be better if Valet didn't unexpectedly overwrite config settings that I've changed manually. At the very least, it would be good to see a warning if Valet is changing config files underneath me.

Additionally, it would be nice to have a way to configure separate settings for CLI and FPM. I realize this part may be more on the package managers for the Homebrew PHP packages, though.

Steps To Reproduce:

1. Edit one of the /*/local/etc/php/*/conf.d/php-memory-limits.ini files.
2. Run valet install or valet use.
3. See that changes have been overwritten and the php-memory-limits.ini file is back to the default contents.

Diagnosis

N/A