[helm chart] Go Template Error: Cannot Compare Slice to nil using eq

[nhuantho]

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• Close: [helm chart] Go Template Error: Cannot Compare Slice to nil using eq #64030

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• Yes (please specify the tool below)

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• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
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[potiuk]

@nhuantho This PR has been converted to draft because it does not yet meet our Pull Request quality criteria.

Issues found:

• ❌ Pre-commit / static checks: Failing: CI image checks / Static checks. Run prek run --from-ref main locally to find and fix issues. See Pre-commit / static checks docs.
• ❌ Unit tests: Failing: Helm tests / Unit tests Helm: airflow_core (K8S 1.30.13), Helm tests / Unit tests Helm: other (K8S 1.30.13), Helm tests / Unit tests Helm: security (K8S 1.30.13). Run failing tests with breeze run pytest <path> -xvs. See Unit tests docs.

What to do next:

• The comment informs you what you need to do.
• Fix each issue, then mark the PR as "Ready for review" in the GitHub UI - but only after making sure that all the issues are fixed.
• There is no rush — take your time and work at your own pace. We appreciate your contribution and are happy to wait for updates.
• Maintainers will then proceed with a normal review.

Converting a PR to draft is not a rejection — it is an invitation to bring the PR up to the project's standards so that maintainer review time is spent productively. There is no rush — take your time and work at your own pace. We appreciate your contribution and are happy to wait for updates. If you have questions, feel free to ask on the Airflow Slack.