The downstream Helm chart (quay.io/rhdh/chart) currently lacks floating "next" tags, making it difficult to reliably reference the latest chart version in CI/E2E testing.

Current State

• RHDH images have next and next-1.y tags (e.g., next, next-1.9)
• Operator bundle has floating 1.y tags at quay.io/rhdh/rhdh-operator-bundle
• Helm chart only has versioned tags like 1.9-xxx-CI with no floating equivalent
• Current workarounds require parsing RHDH image tags to determine the latest chart version

Proposed Solution

Add floating tags to the downstream Helm chart consistent with RHDH image tagging:

• next - points to the latest build from main branch
• next-1.y - points to the latest build from each release branch (e.g., next-1.9, next-1.10)

This aligns with Armel's preference for explicit next naming (vs just 1.y) so the meaning is clear by just seeing the tag.

Acceptance Criteria

• [ ] Helm chart builds publish a floating next tag pointing to the latest main branch build
• [ ] Helm chart builds publish floating next-1.y tags for each active release branch (e.g., next-1.9, next-1.10)
• [ ] Tags are automatically updated with each new nightly/CI build
• [ ] Tag naming follows RHDH image convention (next, next-1.y) for consistency
• [ ] CI/E2E tests can reference next or next-1.y tags instead of hardcoded versions
• [ ] Documentation updated to reference the new tags for testing purposes

Related Issues

• RHIDP-9139 - [CI] automatically use correct Helm Chart version in e2e
• RHIDP-11546 - Build a new quay.io/rhdh/chart for each new updated index image