Helm: Support OCI

[julienduchesne]

Closes #830

To support OCI registries for Helm charts:

• we need to pass the full URL when pulling those charts
• versioning is not necessarily semver now
• the repo update cmd is a no-op for OCI packages but still necessary for Helm repositories

[github-actions]

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2023-06-06 12:43 UTC

[jvrplmlmn]

LG2M 👍

I attempted to verify it with the reproduction steps described in #830 but the add-repo command seems incorrect.

I was able to verify this as working with:

tk tool charts init
tk tool charts add-repo karpenter oci://public.ecr.aws/karpenter
tk tool charts add karpenter/karpenter@v0.27.1

$ tk tool charts add karpenter/karpenter@v0.27.1
{"level":"info","time":"2023-06-06T11:36:29+02:00","message":"Adding 1 Charts ..."}
{"level":"info","time":"2023-06-06T11:36:29+02:00","message":"OK: karpenter/karpenter@v0.27.1"}
{"level":"info","time":"2023-06-06T11:36:29+02:00","message":"Added 1 Charts to helmfile.yaml. Vendoring ..."}
{"level":"info","time":"2023-06-06T11:36:29+02:00","message":"Vendoring..."}
{"level":"info","time":"2023-06-06T11:36:29+02:00","message":"Syncing Repositories ..."}
{"level":"info","time":"2023-06-06T11:36:30+02:00","message":"Pulling Charts ..."}
Pulled: public.ecr.aws/karpenter/karpenter:v0.27.1
Digest: sha256:3423c1f0636177cf3894d986759831a952307092528e761c4942660a5f39417e
{"level":"info","time":"2023-06-06T11:36:32+02:00","message":"karpenter/karpenter@v0.27.1 downloaded"}