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Push chart to Artifact Registry

Pre-requisites

You will need to have an Artifact registry repository created

Create AR Repo 
resource "google_artifact_registry_repository" "helm-store" {
  repository_id = "helm-store"
  description   = "helm chart store"
  format        = "DOCKER"
  project       = var.project
  location      = var.region
  labels = {
    creator = "bstannard"
    use = "helm-chart-storage"
    user = "bstannard"
  }
}

Update the version field in Chart.yaml

apiVersion: v2
name: dummy-demo-chart
description: A Helm chart for Kubernetes
type: application
version: 0.1.0
appVersion: "1.16.0"

apiVersion: v2
name: dummy-demo-chart
description: A Helm chart for Kubernetes
type: application
version: 0.2.0
appVersion: "1.16.0"

Once you have bumped the version, you can package it

Packaging the chart

helm package <path to chart>

Push the chart

helm push <chart name>-*.tgz oci://europe-west2-docker.pkg.dev/<your GCP project name>/helm-store/

Errors

If you get the below 403 error

Error: failed to authorize: failed to fetch anonymous token: unexpected status from GET request to https://europe-west2-docker.pkg.dev/v2/token?scope=repository%3Abreadnet-container-store%2Fhelm-store%2Fredacted%3Apull&scope=repository%3Abreadnet-container-store%2Fhelm-store%2Fredacted%3Apull%2Cpush&service=europe-west2-docker.pkg.dev: 403 Forbidden

You should navigate to the Repository in Google Cloud and click the Sectup Instructions

You will need to basically run the below command for your regions

gcloud auth configure-docker \
    europe-west2-docker.pkg.dev

Using GCS as a helm repo