Summary

Helm repo alias is supported in chart dependency, but we can't reuse it when using a chart as source in an Application.

Motivation

It would be useful to reuse the alias and not have to reuse the URL if already added in the repo list.
We also need to provide the full URL in the project allowed sources, where we could provide a short alias.

Proposal

Support the same patterns in repoURL (when Helm is the source type) as in the helm dependencies:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: sealed-secrets
  namespace: argocd
spec:
  project: default
  source:
    chart: sealed-secrets
    repoURL: "@sealed-secrets" or "alias:sealed-secrets"
    targetRevision: 1.16.1
    helm:
      releaseName: sealed-secrets

Do you think it would make sense ?

If so I can propose a PR.