Installation fails with py312

[ssbarnea]

I am getting the following error while using pip4a to install collection in editable mode, I am getting the following error. For those of you who have already used this tool, any clue why this is happening?

(venv) ➜  testname git:(main) ✗ pip4a install -e .
Critical: Failed to copy collection to build directory: Command 'cp -r --parents
          $(git ls-files 2> /dev/null || ls)
          /Users/prsahoo/.virtualenvs/creator/.pip4a/testns.testname/build'
          returned non-zero exit status 64. cp: illegal option -- -
          usage: cp [-R [-H | -L | -P]] [-fi | -n] [-aclpSsvXx] source_file
          target_file
                 cp [-R [-H | -L | -P]] [-fi | -n] [-aclpSsvXx] source_file ...
          target_directory

[ssbarnea]

This bug is specific to macos and happens because we mistakenly used the --parents option on cp which is not available under BSD.

We need to switch to use of shutil.copytree() instead and also enable macos testing pipelines.