GitHub CI updates for macOS #744
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The Brew pyyaml package has been disabled. Installing globally with pip3 was a problem before, so go with the only remaining option of installing locally into a python virtual environment.
And add a procedure for getting the macOS version, which could be used to look for specifically for the behavior of macOS 15 versus earlier versions, but decided just to use a wildcard for the directory
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This implements two workarounds for CI failures on macOS and resolves #740 by removing the
macos-12target (deprecated) and addsmacos-15(beta).The GitHub runners for macOS have a pre-installed python whose links interfere with the install of python by Homebrew -- which can happen if we try to install something that has python as a dependency, at a version newer than what is pre-installed. There is an open issue for this, 9966 in the
actions/runner-imagesrepo.A workaround is needed for macOS 14 and above because Homebrew has deactivated the
pyyamlformulae. There were issuing installing it withpip, which is why we switched to Homebrew; the remaining option is to install it using a local virtual environment. (Which in theory could be used by all the macOS versions, but for now we leavemacos-13the way it was, usingpip.)