There was recent changes to cri to bring in a Windows section containing a
security context object to the pod config. Before this there was no way to specify
a user for the pod sandbox container to run as. In addition, the security context
is a field for field mirror of the Windows container version of it, so add the
ability to specify a GMSA credential spec for the pod sandbox container as well.
Signed-off-by: Daniel Canter <dcanter@microsoft.com>
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