Merge pull request #5252 from jedevc/add-pb-empty-to-ssh-secret #21

Job	Run time
build (windows/amd64)	1m 51s
build (freebsd/amd64)	1m 34s
test-freebsd-amd64	23m 54s
test-windows-amd64 (containerd, ./client)	4m 30s
test-windows-amd64 (containerd, ./cmd/buildctl)	2m 36s
test-windows-amd64 (containerd, ./worker/containerd)	5m 22s
test-windows-amd64 (containerd, ./solver)	5m 13s
test-windows-amd64 (containerd, ./frontend)	3m 11s
test-windows-amd64 (containerd, ./frontend/dockerfile)	9m 43s
test-windows-amd64 (./..., 1)	12m 41s
	1h 10m 35s

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