git: allow cloning commit shas not referenced by branch/tag #5217

Job	Run time
govulncheck	1m 5s
prepare	8s
binaries (darwin/amd64)	1m 14s
binaries (darwin/arm64)	1m 1s
binaries (linux/amd64)	2m 3s
binaries (linux/arm/v7)	1m 54s
binaries (linux/arm64)	1m 58s
binaries (linux/s390x)	2m 15s
binaries (linux/ppc64le)	2m 4s
binaries (linux/riscv64)	2m 19s
binaries (windows/amd64)	1m 53s
binaries (windows/arm64)	1m 39s
test / prepare	2m 2s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	7m 32s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	8m 59s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	7m 35s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	8m 21s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 13s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	4m 57s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 43s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	5m 14s
test / run (./..., 1, integration gateway)	4m 41s
test / run (./client, containerd, nydus, integration)	7m 20s
test / run (./client, oci, nydus, integration)	5m 7s
test / run (./..., nydus, 1, integration)	4m 24s
image	8m 47s
image (rootless)	9m 4s
release	7s
scout	0s
	1h 54m 39s

Provide feedback