ci: update docs upstream validation workflow #2852

Job	Run time
prepare-binaries	5s
buildkit-edge	2m 28s
prepare-test	1m 58s
binaries (darwin/amd64)	2m 46s
binaries (darwin/arm64)	2m 32s
binaries (linux/amd64)	2m 17s
binaries (linux/arm/v6)	2m 35s
binaries (linux/arm/v7)	2m 5s
binaries (linux/arm64)	2m 4s
binaries (linux/ppc64le)	2m 49s
binaries (linux/riscv64)	2m 8s
binaries (linux/s390x)	2m 14s
binaries (windows/amd64)	2m 33s
binaries (windows/arm64)	2m 12s
test (docker, ./tests)	4m 0s
test (docker\+containerd, ./tests)	4m 42s
test (docker-container, ./tests)	3m 35s
test (remote, ./tests)	3m 19s
test (./..., 1)	5m 7s
release	19s
bin-image	0s
	51m 48s

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