chore: set pb.Empty
on ssh and secret mounts
#5252
Merged
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See #5251 (comment).
These mounts have no vertex inputs, and so should be explicitly marshaled as such.
I think this is the "root cause" of docker/buildx#2479, but since marshaling is done on the client, #5251 is still required. However, the client should explicitly indicate that there is no vertex input on these special mount types.