Allow explicitly specifying Linux distribution #798

Job	Run time
lint	22s
container_test (archlinux, true)	2m 33s
abs_paths_test (true)	2m 16s
container_test (archlinux, false)	2m 33s
external_test (macos-13, latest, true)	11m 52s
abs_paths_test (false)	2m 11s
sys_paths_test (true)	3m 22s
container_test (debian, true)	2m 27s
external_test (macos-13, latest, false)	7m 52s
sys_paths_test (false)	3m 25s
container_test (debian, false)	2m 32s
external_test (ubuntu-latest, latest, true)	8m 9s
container_test (fedora, true)	2m 34s
external_test (ubuntu-latest, latest, false)	7m 56s
test (macos-latest, 7.0.0, true)	1m 54s
container_test (fedora, false)	2m 36s
xcompile_test (true)	2m 20s
test (macos-latest, 7.0.0, false)	1m 58s
container_test (suse_leap, true)	3m 11s
test (macos-latest, latest, true)	1m 59s
container_test (suse_leap, false)	3m 5s
test (macos-latest, latest, false)	2m 23s
container_test (suse_tumbleweed, true)	2m 39s
test (ubuntu-latest, 7.0.0, true)	2m 13s
xcompile_test (false)	2m 4s
container_test (suse_tumbleweed, false)	2m 38s
test (ubuntu-latest, 7.0.0, false)	2m 8s
test (ubuntu-latest, latest, true)	2m 11s
container_test (ubuntu_20_04, true)	2m 58s
container_test (ubuntu_20_04, false)	2m 27s
test (ubuntu-latest, latest, false)	2m 11s
container_test (ubuntu_22_04, true)	2m 34s
container_test (ubuntu_22_04, false)	2m 27s
container_test (linux_sysroot, true)	2m 30s
container_test (linux_sysroot, false)	2m 34s
	1h 51m 4s

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