Chart: add POD_NAME env for leader election

[Aakcht]

Purpose of this PR

PR #1983 made leader election resourcelock to work based on POD_NAME identity(see the changes in main.go file). However POD_NAME environment variable is not being passed to spark operator pod. This results in the error described in #1987.

Resolves #1987 .

Proposed changes:
This PR adds POD_NAME environment variable to spark operator pods when leader_election is required.

Change Category

Indicate the type of change by marking the applicable boxes:

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

Checklist

Before submitting your PR, please review the following:

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

[vara-bonthu]

@Aakcht Could you confirm if you have tested and deployed the Helm chart with this PR? Please provide evidence here

[Aakcht]

Hi, @vara-bonthu ! Yes, I tested that with this change and with replicaCount set to 2 the problem from #1987 goes away and spark-operator deploys successfully.
Also, just in case, I tested that with replicaCount set to 1 nothing breaks ( since #1987 does not affect the deployment with replicaCount: 1) .

Please tell me if some other evidence is needed.

[yuchaoran2011]

/lgtm. This is a good catch. Thanks for the fix

[yuchaoran2011]

/lgtm

[google-oss-prow]

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