ci: run helm dependency update before packaging charts

[kupratyu-splunk]

helm package fails when Chart.yaml declares dependencies but charts/ directory is missing the downloaded tarballs. Adding helm dependency update for each chart before packaging resolves the missing dependencies error.

Description

Related Issues

• Related to #

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test improvement
• CI/CD improvement
• Chore (dependency updates, etc.)

Changes Made

Testing Performed

• Unit tests pass (make test)
• Linting passes (make lint)
• Integration tests pass (if applicable)
• E2E tests pass (if applicable)
• Manual testing performed

Test Environment

• Kubernetes Version:
• Cloud Provider:
• Deployment Method:

Test Steps

Documentation

• Updated inline code comments
• Updated README.md (if adding features)
• Updated API documentation
• Updated deployment guides
• Updated CHANGELOG.md
• No documentation needed

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have updated the Helm chart version (if applicable)
• I have updated CRD schemas (if applicable)

Breaking Changes

Impact:

Migration Path:

Screenshots/Recordings

Additional Notes

Reviewer Notes

Please pay special attention to:

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Pull request overview

This PR updates the Helm chart release workflow to ensure chart dependencies are downloaded into each chart’s charts/ directory before running helm package, preventing packaging failures when Chart.yaml declares dependencies but the dependency tarballs are not present.

Changes:

• Run helm dependency update for helm-chart/splunk-ai-operator prior to packaging.
• Conditionally run helm dependency update for helm-chart/splunk-ai-platform (if the chart exists) prior to packaging.

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