build

ci: reduce jobs to 3 on macos runners #641

Job	Run time
linux-glibc-debian-bookworm-gcc	5m 42s
linux-glibc-debian-sid-gcc-riscv64	3m 17s
linux-glibc-debian-sid-llvm-riscv64	3m 52s
linux-glibc-debian-testing-gcc	6m 2s
linux-glibc-debian-testing-llvm	5m 17s
linux-musl-debian-bookworm-gcc	5m 14s
linux-glibc-debian-bookworm-llvm	5m 22s
linux-musl-debian-bookworm-llvm	5m 13s
linux-musl-debian-testing-llvm	5m 18s
linux-musl-debian-testing-gcc	5m 5s
linux-musl-debian-sid-llvm-riscv64	3m 10s
reuse-check	44s
linux-musl-alpine-gcc	2m 56s
spellcheck	4s
linux-musl-alpine-llvm	2m 55s
linux-musl-debian-sid-gcc-riscv64	3m 34s
linux-musl-from-mac	7m 33s
mac-clang	3m 57s
mac-llvm	4m 1s
win-gcc	6m 42s
win-llvm	8m 16s
win-llvm-from-mac	7m 40s
shellcheck	7s
	1h 42m 1s

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