Add support for SHA-256 Git commit IDs #5395

Job	Run time
govulncheck	50s
prepare	6s
binaries (darwin/amd64)	1m 13s
binaries (darwin/arm64)	1m 13s
binaries (linux/amd64)	2m 6s
binaries (linux/arm/v7)	2m 3s
binaries (linux/arm64)	2m 6s
binaries (linux/s390x)	2m 14s
binaries (linux/ppc64le)	2m 10s
binaries (linux/riscv64)	2m 7s
binaries (windows/amd64)	1m 54s
binaries (windows/arm64)	1m 51s
test / prepare	1m 56s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	7m 54s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	9m 19s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 1s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	9m 21s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 46s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 58s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 40s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	5m 28s
test / run (./..., 1, integration gateway)	5m 13s
test / run (./client, containerd, nydus, integration)	7m 53s
test / run (./client, oci, nydus, integration)	5m 23s
test / run (./..., nydus, 1, integration)	5m 10s
image	0s
scout	0s
release	0s
	1h 42m 55s

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