fix(self-managed): update the cassandra chart pin and naming

[along-2017]

Why

Chart helm-nvcf-cassandra 0.20.1 was published with the corrected image
defaults (cassandra 5.0.8-nv-2.0.1; the previous default tag was never
published under the Apache image name). The self-managed stack still
pins 0.19.1 and still points the image at the retired
"bitnami-cassandra" repository, so cassandra installs from main cannot
pull the image.

What changed

• deploy/stacks/self-managed/helmfile.d/01-dependencies.yaml.gotmpl:
  cassandra release chart version 0.19.1 to 0.20.1.
• deploy/stacks/self-managed/global.yaml.gotmpl: point the cassandra
  image at the renamed "cassandra" repository and add a tag knob
  following the migrations pattern; drop the dynamicSeedDiscovery image
  block, which the chart has no key for (dead Bitnami-era values).

Customer Release Notes

Self-hosted: cassandra installs pull the published Apache-based image
by default; environments can still override the tag.

Plan Summary

Cassandra release in the self-managed stack: chart 0.19.1 to 0.20.1,
image repository "bitnami-cassandra" to "cassandra". Image defaults
move to cassandra 5.0.8-nv-2.0.1 and migrations 0.16.0.

Usage

Not applicable

Testing

• Full self-managed stack render with a local environment succeeds and
  emits the renamed image at the published tag for both the cassandra
  container and the cassandra-conf-init initContainer.
• Standalone render of chart 0.20.1 with the CI values confirms the
  chart defaults alone resolve the same tag.
• Stack wiring tests (make -C deploy/stacks/self-managed test) pass.
• tests/bdd short suite passes (it asserts on global.yaml.gotmpl).
• The migrations 0.16.0 image is published.

Notes

Overlaps with the CLI install-path PR, which carries the same
global.yaml.gotmpl rename for the BDD suite: after this merges, that
branch needs a rebase that drops its duplicate hunk, and the
cassandra.image.tag pins in its BDD fixtures become redundant.

References

Relates to #1019

Summary by CodeRabbit

• Chores
  • Updated the Cassandra deployment component to a newer chart version.
  • Updated Cassandra image configuration to use the standard Cassandra image repository.
  • Added support for optionally specifying a Cassandra image tag for more flexible deployment control.

[coderabbitai]

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📥 Commits

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• deploy/stacks/self-managed/global.yaml.gotmpl

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📝 Walkthrough

Walkthrough

The self-managed deployment updates the Cassandra chart to 0.20.1. It also changes the initialization image repository to cassandra and supports an optional configured image tag.

Changes

Cassandra deployment update

Layer / File(s)	Summary
Update Cassandra chart version deploy/stacks/self-managed/helmfile.d/01-dependencies.yaml.gotmpl	The Cassandra release now uses chart version 0.20.1.
Update Cassandra image configuration deploy/stacks/self-managed/global.yaml.gotmpl	The Cassandra initialization image uses the cassandra repository and conditionally applies cassandra.image.tag.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to ecc41

The PR updates the self-managed Cassandra chart and image defaults so installs use the published Apache-based image while preserving tag overrides; no actionable merge-blocking risk remains after normal checks and review.

Possibly related PRs

• NVIDIA/nvcf#934: Updates related self-managed Cassandra chart and image configuration.
• NVIDIA/nvcf#1015: Updates the Cassandra image repository and configurable image tag.

Suggested reviewers: rohithb-hub, sparve-nv

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits format and accurately describes the Cassandra chart pin and naming updates.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/self-managed/update-cassandra-chart-0.20.1

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