Add Checksums and Attestation #477

Job	Run time
build (android, 386, i686-linux-android)	41s
build (android, amd64, x86_64-linux-android)	44s
build (android, arm, armv7a-linux-androideabi)	39s
build (android, arm64, aarch64-linux-android)	1m 4s
build (darwin, amd64)	37s
build (darwin, arm64)	44s
build (dragonfly, amd64)	43s
build (freebsd, 386)	38s
build (freebsd, amd64)	41s
build (freebsd, arm)	30s
build (freebsd, arm64)	29s
build (illumos, amd64)	30s
build (linux, 386)	39s
build (linux, amd64)	39s
build (linux, arm)	44s
build (linux, arm, 5)	47s
build (linux, arm64)	1m 4s
build (linux, ppc64)	36s
build (linux, ppc64le)	35s
build (linux, mips)	43s
build (linux, mipsle)	48s
build (linux, mips64)	48s
build (linux, mips64le)	45s
build (linux, riscv64)	39s
build (linux, s390x)	35s
build (linux, loong64)	42s
build (netbsd, 386)	43s
build (netbsd, amd64)	42s
build (netbsd, arm)	43s
build (netbsd, arm64)	40s
build (openbsd, 386)	43s
build (openbsd, amd64)	39s
build (openbsd, arm)	32s
build (openbsd, arm64)	33s
build (plan9, 386)	29s
build (plan9, amd64)	27s
build (plan9, arm)	38s
build (solaris, amd64)	33s
build (windows, 386, .exe)	38s
build (windows, amd64, .exe)	39s
build (windows, arm, .exe)	43s
build (windows, arm64, .exe)	36s
run-tests	2m 18s
build and deploy to deb repo	1s
deploy to github	0s
	30m 21s

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