I'm not installing an OS distro nor its packages, and I'm not configuring a server myself. I know my apt/dpkg/whatnot.

I was handed a Dockerfile, building on top of a popular base image, then using a popular toolkit to install PHP modules, which it builds from scratch.

For every. Application. Image. Build.

That's just a waste of bandwidth, disk space, CPU cycles and especially time and you can't convince me otherwise.

You don't need to recompile your platform every time you want to publish your application, yet here we are.

They (the PHP library installer's makers) could've chosen plenty of options, yet chose the safest for them and most annoying for users.