Command ['/bin/sh', '-c', 'python /Users/runner/work/klayout/klayout/testdata/pymod/import_db.py && python /Users/runner/work/klayout/klayout/testdata/pymod/import_rdb.py && python /Users/runner/work/klayout/klayout/testdata/pymod/import_tl.py && python /Users/runner/work/klayout/klayout/testdata/pymod/import_lib.py && python /Users/runner/work/klayout/klayout/testdata/pymod/import_lay.py && TESTSRC=/Users/runner/work/klayout/klayout python /Users/runner/work/klayout/klayout/testdata/pymod/pya_tests.py'] failed with code 1.

Process completed with exit code 1.

While cibuildwheel can build CPython 3.8 universal2/arm64 wheels, we cannot test the arm64 part of them, even when running on an Apple Silicon machine. This is because we use the x86_64 installer of CPython 3.8. See the discussion in https://github.com/pypa/cibuildwheel/pull/1169 for the details. To silence this warning, set `CIBW_TEST_SKIP: "cp38-macosx_*:arm64"`.