track rustls alpha.6 #1308

Job	Run time
Clippy	40s
Build+test (clang, stable, ubuntu-20.04)	46s
Clippy nightly (optional)	21s
Clang Tidy	7s
Build+test (clang, beta, ubuntu-20.04)	46s
Check for documentation errors	17s
Build+test (clang, nightly, ubuntu-20.04)	41s
ensure-header-updated	1m 5s
Format	14s
Build+test (clang, 1.61.0, ubuntu-20.04)	4m 24s
Check minimum versions	41s
Build+test (gcc, stable, ubuntu-20.04)	41s
Miri	50s
Build+test (gcc, beta, ubuntu-20.04)	36s
Windows	1m 58s
Windows CMake, Debug configuration	1m 55s
Build+test (gcc, nightly, ubuntu-20.04)	37s
Windows CMake, Release configuration	1m 56s
Build+test (gcc, 1.61.0, ubuntu-20.04)	4m 33s
Valgrind	52s
Build+test (macos-latest, clang, stable)	3m 55s
	27m 55s

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