"multiple deploy.kubectl.defaultNamespace values set" warning when building

[AndreasBergmeier6176]

When calling skaffold build we get errors like:

time="2025-01-31T10:37:58Z" level=warning msg="multiple deploy.kubectl.defaultNamespace values set (foo, bar), only last pipeline's value will be used" subtask=-1 task=DevLoop

while there will never be any deployment. Warnings should only appear when actually deploying.