[k8s] Add netcat to dependency checks #2712
Merged
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Closes #2626. Adds preemptive check for netcat before trying provisioning.
Tested (run the relevant ones):
bash format.sh
sky launch -c test --cloud kubernetes
on a docker container with a) Neithersocat
nornc
b) withsocat
, but withoutnc
c) with all dependencies.