ci: update docs upstream validation workflow #2848

Job	Run time
prepare-binaries	4s
buildkit-edge	1m 59s
prepare-test	2m 45s
binaries (darwin/amd64)	2m 47s
binaries (darwin/arm64)	2m 42s
binaries (linux/amd64)	2m 22s
binaries (linux/arm/v6)	2m 5s
binaries (linux/arm/v7)	2m 2s
binaries (linux/arm64)	2m 30s
binaries (linux/ppc64le)	2m 20s
binaries (linux/riscv64)	2m 30s
binaries (linux/s390x)	2m 8s
binaries (windows/amd64)	2m 16s
binaries (windows/arm64)	2m 38s
test (docker, ./tests)	5m 8s
test (docker\+containerd, ./tests)	4m 2s
test (docker-container, ./tests)	3m 38s
test (remote, ./tests)	3m 26s
test (./..., 1)	4m 46s
release	20s
bin-image	0s
	52m 28s

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