ci: scan images with docker scout #4327

Job	Run time
prepare	4s
binaries (darwin/amd64)	1m 10s
binaries (darwin/arm64)	59s
binaries (linux/amd64)	1m 56s
binaries (linux/arm/v7)	1m 52s
binaries (linux/arm64)	1m 52s
binaries (linux/s390x)	1m 59s
binaries (linux/ppc64le)	1m 54s
binaries (linux/riscv64)	2m 11s
binaries (windows/amd64)	1m 49s
binaries (windows/arm64)	1m 39s
test / prepare	1m 45s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	7m 24s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	8m 42s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	7m 47s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	9m 0s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 0s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 11s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 22s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	5m 34s
test / run (./..., 1, integration gateway)	4m 13s
test / run (./client, containerd, nydus, integration)	7m 6s
test / run (./client, oci, nydus, integration)	5m 10s
test / run (./..., nydus, 1, integration)	4m 2s
image	10m 47s
image (rootless)	10m 51s
release	6s
scout	0s
	1h 55m 25s

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