An oft employed scheme for a lot of our APIs is to include an
annotations field which is just a map of string to string. This
usually allows folks using the API to send over metadata or auxiliary
information without needing to get a new field added (especially where
the field might not make sense for it to be a standalone field). I think
having annotations for CreateSandbox make sense for this same use case.
Signed-off-by: Danny Canter <danny@dcantah.dev>
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