Repository navigation

release: the mirror step's cap was shorter than the deadline it was g… #1360

Job	Run time
build + unit tests (linux x86_64, self-host)	12m 37s
toolchain: gcc (cold self-host)	6m 31s
integration: mcpp builds & runs xlings	9m 23s
toolchain: musl + llvm	9m 21s
	37m 52s