consul: pull chart via artifactapi helm mirror (#528)

The consul overlay fetches its chart directly from helm.releases.hashicorp.com, while the other 15 helm overlays on the estate mirror use the artifactapi virtual helm repo, which already proxies hashicorp-helm.

- point consul helmCharts repo at the artifactapi virtual helm repo

Reviewed-on: #528
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/overlays/au-syd1/consul/kustomization.yaml

@@ -7,7 +7,7 @@ resources:
 
 helmCharts:
   - name: consul
-    repo: https://helm.releases.hashicorp.com
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
     version: "1.9.7"
     releaseName: consul
     namespace: consul