These commands accept two arguments; the first is a custom name,
the second is either a filename or "-" to create from STDIN.
With this patch:
# does not provide completion
docker secret create <tab>
# starts providing completion once a non-empty name is provided
docker secret create somename<tab>
file.txt other-file.txt
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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