Update deployment.rst: Adding alternative way to clear the cache

[ThomasLandauer]

Page: https://symfony.com/doc/5.x/deployment.html#d-clear-your-symfony-cache

Reason: I have an app which "suddenly" produces a memory overflow upon cache:clear, but otherwise runs fine. Searching around, I found out that many people encounter this problem, for various reasons. So I'm figuring it's not so easy to really fix this in the Symfony code. So, I guess it's a good idea to show people an alternative way. Cause when deploying, and cache:clear crashes, you probably need a solution fast ;-)

[javiereguiluz]

I'm closing this one as "won't fix". The reason is that it doesn't feel correct to show this as an official best-practice.

If you run cache:clear --no-warmup it will probably work as expected, so the "issue" might be in the warm-up process. Most folks can run that command without any issues ... but, in edge-cases, you might have to run it as php -d memory_limit=-1 bin/console cache:warmup Setting unlimited memory might look bad, but it's common e.g. when running Composer commands to install/update.

Thanks.

[ThomasLandauer]

@javiereguiluz On a shared webhost, you cannot increase memory.
That's why I still think it's a good idea to show this as last resort - not as best practice.