git: allow cloning commit shas not referenced by branch/tag #5226

Job	Run time
govulncheck	1m 6s
prepare	5s
binaries (darwin/amd64)	1m 11s
binaries (darwin/arm64)	1m 10s
binaries (linux/amd64)	1m 55s
binaries (linux/arm/v7)	2m 4s
binaries (linux/arm64)	1m 55s
binaries (linux/s390x)	1m 57s
binaries (linux/ppc64le)	2m 8s
binaries (linux/riscv64)	1m 58s
binaries (windows/amd64)	1m 39s
binaries (windows/arm64)	1m 42s
test / prepare	2m 8s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 5s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	9m 25s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 27s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	9m 53s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 42s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 56s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 53s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	5m 32s
test / run (./..., 1, integration gateway)	4m 43s
test / run (./client, containerd, nydus, integration)	7m 51s
test / run (./client, oci, nydus, integration)	5m 53s
test / run (./..., nydus, 1, integration)	5m 2s
image	1s
scout	1s
release	1s
	1h 43m 23s

Provide feedback