new signing algorithm and support of BlockPi #140

Job	Run time
check (ubuntu-latest, nightly)	1m 35s
check (ubuntu-latest, beta)	1m 38s
check (ubuntu-latest, stable)	1m 40s
fmt (ubuntu-latest, nightly)	26s
fmt (ubuntu-latest, beta)	20s
fmt (ubuntu-latest, stable)	23s
lint (ubuntu-latest, nightly)	1m 38s
lint (ubuntu-latest, beta)	1m 39s
lint (ubuntu-latest, stable)	1m 40s
test (ubuntu-latest, nightly)	1m 52s
test (ubuntu-latest, beta)	1m 54s
test (ubuntu-latest, stable)	2m 0s
test (macos-latest, nightly)	1m 41s
test (macos-latest, beta)	1m 13s
test (macos-latest, stable)	1m 35s
binary-build (ubuntu-latest, nightly)	2m 20s
binary-build (ubuntu-latest, beta)	2m 27s
binary-build (ubuntu-latest, stable)	2m 27s
binary-build (macos-latest, nightly)	1m 47s
binary-build (macos-latest, beta)	2m 3s
binary-build (macos-latest, stable)	2m 5s
container-build (ubuntu-latest)	3m 48s
container-build-and-push	0s
deployment-commitment	0s
	38m 11s

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