llb: deterministic marshaling for protobuf and store results from multiple constraints #5033

Job	Run time
govulncheck	59s
prepare	5s
binaries (darwin/amd64)	1m 3s
binaries (darwin/arm64)	1m 13s
binaries (linux/amd64)	1m 55s
binaries (linux/arm/v7)	1m 56s
binaries (linux/arm64)	2m 1s
binaries (linux/s390x)	2m 10s
binaries (linux/ppc64le)	1m 55s
binaries (linux/riscv64)	2m 18s
binaries (windows/amd64)	1m 35s
binaries (windows/arm64)	1m 35s
test / prepare	1m 50s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	2m 20s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	2m 19s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	2m 19s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	2m 22s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	2m 22s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	2m 20s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	2m 20s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	2m 24s
test / run (./..., 1, integration gateway)	2m 20s
test / run (./client, containerd, nydus, integration)	2m 20s
test / run (./client, oci, nydus, integration)	2m 21s
test / run (./..., nydus, 1, integration)	2m 21s
image	1s
scout	1s
release	1s
	48m 46s

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