add support for kind clusters

[jrobsonchase]

What

• Sets KUBECONFIG to a direnv-managed file.

• Adds a couple of scripts to make developement with kind easier:

  • scripts/kind-up.sh
    Start a kind cluster with a local registry

  • scripts/kind-down.sh
    Delete the kind cluster and its registry

• Exposes the REGISTRY as an option to the Makefile and defaults it
  to localhost:5001, which is the one used by the kind cluster.

• The make deploy job now has a dependency on docker-push to get the
  image into the kind registry.

• Sets the image pull policy to "Always" when deploying to ensure that
  kind pulls the latest image.

Breaking Changes

Might break some non-kind workflows with the "push" requirement and
defaulting to localhost:5001 for the registry.

[jrobsonchase]

• add support for kind clusters #275 👈
• main

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