Updated tests in frontend/dockerfile/dockerfile_test.go to run on Win… #5322

Job	Run time
govulncheck	57s
prepare	6s
binaries (darwin/amd64)	59s
binaries (darwin/arm64)	1m 12s
binaries (linux/amd64)	2m 6s
binaries (linux/arm/v7)	2m 14s
binaries (linux/arm64)	2m 6s
binaries (linux/s390x)	2m 2s
binaries (linux/ppc64le)	2m 9s
binaries (linux/riscv64)	2m 11s
binaries (windows/amd64)	1m 42s
binaries (windows/arm64)	1m 47s
test / prepare	2m 0s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	13m 30s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	14m 11s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	11m 49s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	12m 36s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	5m 39s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 54s
test / run (oci-rootless-slirp4netns-detachnetns, ./client ./cmd/buildctl ./worker/containerd ./solver ....	5m 49s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	9m 31s
test / run (./..., 1, integration gateway)	7m 50s
test / run (./client, containerd, nydus, integration)	10m 57s
test / run (./client, oci, nydus, integration)	8m 32s
test / run (./..., nydus, 1, integration)	8m 43s
image	0s
scout	0s
release	0s
	2h 19m 32s

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