add a new helm parameter for image pull secrets

[boddumanohar]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

Hi @boddumanohar. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[boddumanohar]

imagePullSecrets is already added in the README.md of helm chart.
https://github.com/kubernetes-sigs/azuredisk-csi-driver/blob/master/charts/README.md

[andyzhangx]

/ok-to-test

[k8s-ci-robot]

@boddumanohar: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-azuredisk-csi-driver-e2e-multi-az-v2	f5c6cee	link	/test pull-azuredisk-csi-driver-e2e-multi-az-v2

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[andyzhangx]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, boddumanohar

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