feat: add POD_NAMESPACE environment var

[mfhunruh]

What type of PR is this?
/kind feature

What this PR does / why we need it:

It's better to use a dynamic environment variable POD_NAMESPACE based on the value of the metadata.namespace field. This will simplify deployment for those who use kubectl/kustomize instead of Helm.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mfhunruh (901d130, c38f88b)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mfhunruh. Thanks for your PR.

I'm waiting for a kubernetes-csi 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.

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[coveralls]

Pull Request Test Coverage Report for Build 14558679265

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.178%

---

Totals
Change from base Build 14372110776:	0.0%
Covered Lines:	1107
Relevant Lines:	1416

---

💛 - Coveralls

[andyzhangx]

/ok-to-test
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [andyzhangx]

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[k8s-ci-robot]

@mfhunruh: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-csi-driver-nfs-e2e-capz	901d130	link	false	/test pull-csi-driver-nfs-e2e-capz

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.

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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-sigs/prow repository. I understand the commands that are listed here.

[andyzhangx]

/retest