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Note to reviewers: remember to look at the commits in this PR and consider if they can be squashed
Note to contributors: remember to re-generate client set if there are any API changes
Summary Of Changes
The previous approach was always checking the existence of variables,
even for targets that did not require them e.g.
make fmt
would fail ifany docker/registry variable was not defined. Now only targets that
actually use those variable check for their definition state.
We use some YTT where doing something very simple e.g. updating a
container image, is terribly complicated in kustomize. Observe and
compare deploy-dev vs deploy-local
"Local" targets that build containers locally and reference them in
manifests, without pushing them. This is particularly useful in local
environments, e.g. Docker Desktop, Rancher Desktop, where docker
context is the same for Kuberentes and Image Building.