add ps command to eliminate exception while running integration tests

[piotrkwiecinski]

Install ps command on the php container to eliminate while running integration tests:

Fatal error: Uncaught Exception: sh: 1: tasklist.exe: not found in /var/www/html/vendor/magento/framework/Shell.php:63

It's not a fault of the memory check command in magento core. It's more a workaround for now if you're happy to merge.
Reference in core: https://github.com/magento/magento2/blob/2.4-develop/dev/tests/integration/framework/Magento/TestFramework/Helper/Memory.php#L49-L61

I hope to have some time next week to see if I can fix that in core. Anyway it'll take some time to be released even if fix is merged.

ps can also be installed manually using:

bin/root apt update
bin/root apt install procps

[markshust]

Thanks! I saw no reason to not merge this in. I'll rebuild the images shortly.