feat: add clickhouse-cluster helm chart

[GrigoryPervakov]

Why

For the projects with Helm-based deployment, it's convenient to use a Helm chart to deploy a CRs to create a cluster

What

Introduced a new Helm chart for keeper+clickhouse deployment.
values.yaml are generated from the CRD to represent the chart structure

[Copilot]

Pull request overview

Adds a new “clickhouse-cluster-helm” Helm chart intended to deploy a ClickHouseCluster + KeeperCluster CR pair (with generated values.yaml derived from CRD schemas), alongside CI/release automation updates and an e2e deployment test that installs the new chart.

Changes:

• Introduce a new cluster Helm chart under dist/chart-cluster/ that renders ClickHouseCluster and KeeperCluster CRs.
• Add a Go-based generator (tools/gen-cluster-chart) to produce the cluster chart’s values.yaml from CRD schemas and wire it into make + CI.
• Extend helm-based deployment tests to install and validate the new cluster chart.

Reviewed changes

Copilot reviewed 7 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/gen-cluster-chart/templates/values.yaml.tmpl	Template used by the generator to render values.yaml field blocks from CRD-derived schema data.
tools/gen-cluster-chart/main.go	New generator binary that reads CRDs and renders the chart values.yaml.
test/deploy/deploy_test.go	Adds a helm-install-based validation path for the new cluster chart.
README.md	Documents installing a sample cluster via the new clickhouse-cluster-helm chart.
Makefile	Adds targets to build/run the generator and package/push/lint the new cluster chart.
dist/chart-cluster/values.yaml	Generated default values for the new cluster chart.
dist/chart-cluster/templates/NOTES.txt	Post-install notes for the cluster chart.
dist/chart-cluster/templates/keeper-cluster.yaml	Template for rendering a KeeperCluster CR from values.
dist/chart-cluster/templates/clickhouse-cluster.yaml	Template for rendering a ClickHouseCluster CR (including optional keeperClusterRef wiring).
dist/chart-cluster/templates/_helpers.tpl	Naming helpers for the cluster chart.
dist/chart-cluster/Chart.yaml	New chart metadata for clickhouse-cluster-helm.
dist/chart-cluster/.helmignore	Ignore rules for packaging the new chart.
.github/workflows/release.yaml	Packages and publishes the cluster chart artifact and OCI push during releases.
.github/workflows/ci.yaml	Ensures cluster chart generation is checked and cluster chart linting runs in CI.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.