WIP: Test GHCR mirror pre-pull for dockcross images #116

Job	Run time
python-build-workflow / build-windows-python-packages (11)	4m 5s
python-build-workflow / build-macos-arm-py (11)	17s
cxx-build-workflow / build-test-cxx (macos-15-intel)	20m 23s
cxx-build-workflow / build-test-cxx (windows-2022)	14m 34s
python-build-workflow / build-linux-arm-py (11)	1m 22s
cxx-build-workflow / build-test-cxx (macos-15)	8m 18s
cxx-build-workflow / build-test-cxx (ubuntu-22.04)	9m 56s
python-build-workflow / build-linux-py (11, _2_28-x64)	1m 49s
python-build-workflow / test-linux-notebooks	-1s
python-build-workflow / publish-python-packages-to-pypi	0s
	1h 0m 43s

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