Commits on Mar 22, 2024

1. cni: fix regression in falling back to DNS owned by dockerd …

   In #20007 we fixed a bug where the DNS configuration set by CNI plugins was not
   threaded through to the task configuration. This resulted in a regression where
   a DNS override set by `dockerd` was not respected for `bridge` mode
   networking. Our existing handling of CNI DNS incorrectly assumed that the DNS
   field would be empty, when in fact it contains a single empty DNS struct.
   
   Handle this case correctly by checking whether the DNS struct we get back from
   CNI has any nameservers, and ignore it if it doesn't. Expand test coverage of
   this case.
   
   Fixes: #20174

   

   tgross committed Mar 22, 2024
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