Updates to include annotations to the service account

[sharkannon]

It would be useful to have annotations on the service account as it's required to use things such as WLI in Google Cloud (https://cloud.google.com/kubernetes-engine/docs/how-to/workload-identity)

[linux-foundation-easycla]

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• ✅ Stephen Herd (3635a81)

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[k8s-ci-robot]

Hi @sharkannon. Thanks for your PR.

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[sharkannon]

I signed it

[damemi]

/ok-to-test

[ingvagabund]

Setting the annotations field in the values.yaml file to:

annotations:
    iam.gke.io/gcp-service-account=GSA_NAME@GSA_PROJECT.iam.gserviceaccount.com

and running help template . --dry-run produces:

# Source: descheduler/templates/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: RELEASE-NAME-descheduler
  labels:
    app.kubernetes.io/name: descheduler
    helm.sh/chart: descheduler-0.22.0
    app.kubernetes.io/instance: RELEASE-NAME
    app.kubernetes.io/version: "0.22.0"
    app.kubernetes.io/managed-by: Helm
  annotations: 
    iam.gke.io/gcp-service-account: GSA_NAME@GSA_PROJECT.iam.gserviceaccount.com

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ingvagabund, sharkannon

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