ci(test-os): fix freebsd job #1708

Job	Run time
prepare	2s
test / prepare	3m 3s
test / run (containerd, ./frontend/dockerfile, integration)	7m 18s
test / run (containerd, ./frontend/dockerfile, dockerfile)	11m 44s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	8m 0s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	14m 6s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	8m 32s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	11m 33s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	10m 10s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	10m 44s
test / run (oci, ./frontend/dockerfile, integration)	6m 16s
test / run (oci, ./frontend/dockerfile, dockerfile)	8m 5s
test / run (oci-rootless, ./frontend/dockerfile, integration)	7m 18s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	7m 44s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	7m 54s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	9m 32s
image (mainline)	10m 18s
image (labs)	11m 14s
release	0s
	2h 33m 33s

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