Pace editable install from requirements_dev.txt is broken

[jdahm]

As of updating pace to gt4py v1.0, the Docker image built in examples/ with make build installs all the dependencies for pace, but not pace itself. #418 was created to quickly work around the problem, but it is not a proper fix.

What needs to happen is that someone tracks down why e.g. pip3 install -e ./physics -c constraints.txt && python3 -c "import pace.physics" fails, revert the Dockerfile change in #418, and make a fix.