[argocd-image-updater] Automate setting up the ArgoCD API Authentication user/secret

[tuananh]

Is your feature request related to a problem?

image updater still need to follow the manual step to setup argocd token as per the instruction here

This make it not ideal for gitops as i'm using argocd to manage argocd-image-updater too.

Describe the solution you'd like

i'm not sure what's the best practice here but we can create an additional field in values.yaml

secret:
  # Whether helm chart creates controller secret
  create: false
  # ArgoCD token so that image updater can talk to ArgoCD API. More information [here](https://argocd-image-updater.readthedocs.io/en/stable/install/start/#connect-using-argo-cd-api-server)
  # argocdToken: ""

and create it with template

{{ if .Values.secret.create }}
apiVersion: v1
kind: Secret
metadata:
  name: argocd-image-updater-secret
  labels:
    {{- include "argocd-image-updater.labels" . | nindent 4 }}
type: Opaque
stringData:
  argocd.token: {{ .Values.secret.argocdToken }}
{{- end }}

Describe alternatives you've considered

No response

Additional context

No response

[tuananh]

Or i'm not sure if maintainer's intention is automate the whole thing:

• create user in argocd by updating argocd-cm for image updater with apiKey
• granting rbac for that account
• generate token for that account
• and use that token to create secret

this maybe possible with hook?

1,2 are already configurable with argocd chart so we should only need to generate token with hook and then use it? i'm thinking we can mount argocd config, use hook and argocd cli to use that config and generate token. then we will use it to create secret. wdyt?

[github-actions]

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