Allow to add additional resources to an Application

[gigi206]

Summary

Add the possibility to add custom resources yaml to an Application.

Motivation

Some charts don't allow to add custom yaml values. In some cases, it could be great to add custom code to the original chart.

Proposal

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: myapp
  namespace: argo-cd
spec:
  project: default
  source:
    repoURL: 'https://github.com/xxx/yyy/'
    path: client/config/crd
    targetRevision: v4.2.1
  destination:
    server: 'https://kubernetes.default.svc'
    namespace: myns
  syncPolicy:
    syncOptions:
      - PruneLast=true
  additionalResources:
    # valueFiles: []
    values: |
      apiVersion: v1
      kind: Service
      metadata:
        name: my-service
      spec:
        selector:
          app: MyApp
        ports:
          - protocol: TCP
            port: 80
            targetPort: 9376

[crenshaw-dev]

Would a multi-source application fit your use case? #8322

[gigi206]

Yes it could :)

I see that I must wait until the 2.5 release ;)

[crenshaw-dev]

Yep! An umbrella chart (pulling in your Helm chart as a dependency of a new, top-level chart) is probably the way to go until then.

[wmgroot]

PR is here for those following.
#10432

[blakepettersson]

Closing since this feature has been out for a while: https://argo-cd.readthedocs.io/en/stable/user-guide/multiple_sources/