Don't build on uknown platforms, reset runs-on. #425

Job	Run time
build_and_test	17s
build_and_test_python (3.10, gcc, macos)	18s
build_and_test_python (3.10, gcc, ubuntu)	21s
build_and_test_python (3.10, clang, macos)	16s
build_and_test_python (3.10, clang, ubuntu)	22s
build_and_test_python (3.11, gcc, macos)	22s
build_and_test_python (3.11, gcc, ubuntu)	16s
build_and_test_python (3.11, clang, macos)	17s
build_and_test_python (3.11, clang, ubuntu)	25s
build_and_test_python (3.12, gcc, macos)	18s
build_and_test_python (3.12, gcc, ubuntu)	18s
build_and_test_python (3.12, clang, macos)	22s
build_and_test_python (3.12, clang, ubuntu)	20s
build_and_test_python (3.10, microsoft, windows)	1m 45s
build_and_test_python (3.11, microsoft, windows)	1m 37s
build_and_test_python (3.12, microsoft, windows)	1m 36s
build_in_docker (debian:sid-slim)	8m 24s
build_in_docker (debian:12-slim)	7m 4s
build_in_docker (ubuntu:latest)	7m 8s
publish_wheels	0s
	31m 46s

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