feat: options to configure local registry

[tthvo]

Fixes #76

Description

Add options to configure an insecure local registry. An example workflow file can be:

name: Create Cluster with Registry

on: pull_request

jobs:
  create-cluster-with-registry:
    runs-on: ubuntu-latest
    steps:
      - name: Kubernetes KinD Cluster
        uses: helm/kind-action@v1
        with:
          registry: true
          registry_name: my-registry
          registry_port: 5001
          registry_enable_delete: true

Does this look alright?

Credits: Thanks https://github.com/container-tools/kind-action for providing the inspiration.

[cpanato]

where this $local_reg come from?
we need to use the github actions syntax and export that as github output, otherwise people will not know how to get that

[tthvo]

Oh yes agree! I updated the action to export the registry address (registry-name:registry-port) at LOCAL_REGISTRY env var. How about now?

[tthvo]

Or would you prefer the it as step output instead?

That being said I think I misunderstood your suggestion. The github output seems like a better and more flexible option here as it avoids any conflicts in env vars. How about now?

[cpanato]

seems ok, just need to revisit the local registry env var to follow github actions best practices

[tthvo]

Hi @cpanato @davidkarlsen, any further comments?