feat: make masterkey secret configurable

[mknet3]

Title

Add support for specifying custom Secrets for the master API key.

Relevant issues

Fixed #9147.
Fixed one of #8954

Pre-Submission checklist

Warning

This PR only introduces changes in Helm Chart. I've introduced a new command in the makefile to run Helm unit tests.

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on (make test-unit)[https://docs.litellm.ai/docs/extras/contributing_code]
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature
✅ Test

Changes

• Added support for specifying masterkeySecretName and masterkeySecretKey in the Helm chart values.
• Updated the deployment template to use the specified secret name and key for the master API key, with defaults if not specified.

New Tests:

• Added unit tests for the new Helm chart values to ensure proper handling of masterkeySecretName and masterkeySecretKey.
• Added tests for the secret creation logic to verify that a secret is created only when masterkeySecretName is not set.

Tests passing: https://github.com/BerriAI/litellm/actions/runs/13883013319/job/38844005616?pr=9288

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 16, 2025 11:47am

[JakobStadlhuber]

Why is it still not available in the newest helm chart https://github.com/BerriAI/litellm/pkgs/container/litellm-helm/376247593?tag=0.1.639 @krrishdholakia ?

[krrishdholakia]

this is on main but not on a release yet

[JakobStadlhuber]

@krrishdholakia do you know when it will be in the release brach?

[krrishdholakia]

Today