Allow user provided platform constraints #899

Job	Run time
lint	17s
external_test (macos-13, latest, true)	8m 55s
external_test (macos-13, latest, false)	9m 20s
abs_paths_test (true)	2m 13s
external_test (ubuntu-latest, latest, true)	7m 42s
container_test (archlinux, true)	2m 26s
abs_paths_test (false)	2m 11s
sys_paths_test (true)	3m 37s
external_test (ubuntu-latest, latest, false)	8m 5s
container_test (archlinux, false)	2m 24s
sys_paths_test (false)	3m 19s
container_test (debian, true)	2m 36s
container_test (debian, false)	2m 42s
test (macos-latest, 7.0.0, true)	1m 56s
container_test (fedora, true)	2m 47s
xcompile_test (true)	1m 53s
xcompile_test (false)	1m 56s
test (macos-latest, 7.0.0, false)	2m 3s
test (macos-latest, latest, true)	2m 2s
test (macos-latest, latest, false)	2m 10s
container_test (fedora, false)	2m 36s
container_test (suse_leap, true)	3m 0s
test (ubuntu-latest, 7.0.0, true)	2m 11s
container_test (suse_leap, false)	2m 54s
container_test (suse_tumbleweed, true)	2m 43s
test (ubuntu-latest, 7.0.0, false)	2m 8s
container_test (suse_tumbleweed, false)	2m 48s
test (ubuntu-latest, latest, true)	2m 25s
container_test (ubuntu_20_04, true)	2m 44s
test (ubuntu-latest, latest, false)	2m 32s
container_test (ubuntu_20_04, false)	2m 37s
container_test (ubuntu_22_04, true)	2m 35s
container_test (ubuntu_22_04, false)	2m 32s
container_test (linux_sysroot, true)	2m 38s
container_test (linux_sysroot, false)	2m 26s
	1h 49m 23s

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