[CHORE]: Helm chart build Makefile with lint and values.schema.json validation + CODEOWNERS, CHANGELOG.md, .helmignore and CONTRIBUTING.md

[crivetimihai]

🧭 Chore Summary — Hardening the Helm Chart charts/mcp-stack

Add the chart-maintenance scaffolding, Makefile and schema so that every Helm release is lintable, schema-validated, and documented out-of-the-box.
Deliver the standard open-source housekeeping files and a tiny Makefile that shields contributors from boiler-plate commands.

---

🧱 Areas Affected

• charts/mcp-stack/

  • NEW values.schema.json
  • NEW CODEOWNERS
  • NEW CHANGELOG.md
  • NEW CONTRIBUTING.md
  • NEW Makefile
  • NEW .helmignore

• CI workflow that already packages & pushes the chart

• Project docs (README may need one-line links)

---

⚙️ Context / Rationale

The chart already ships an excellent README with architecture diagrams and a polished values.yaml .
What's missing are:

• Schema validation – contributors can currently enter a typo in values.yaml and Helm will happily accept it.
• Ownership signals – GitHub can't auto-request reviews without a CODEOWNERS file.
• Change traceability – a CHANGELOG makes it trivial to spot breaking changes between chart versions.
• Contributor guidance – a short CONTRIBUTING doc + Make targets lowers the bar for first-timers.
• Ignore noise – .helmignore trims render time and OCI package size.

---

📋 Acceptance Criteria

• helm lint charts/mcp-stack succeeds on a clean checkout with no extra flags.

• make lint (defined in the new Makefile) runs:

  1. helm lint .
  2. helm template . | kube-val (optional but encouraged)
  3. yamllint on all YAML sources

• make schema validates every default in values.yaml against values.schema.json.

• GitHub highlights the chart OWNERS when a PR touches charts/mcp-stack/**.

• CHANGELOG.md documents at least v0.2.0 → HEAD.

• CI workflow step:

  - name: Helm lint & schema-check
    run: |
      cd charts/mcp-stack
      make lint

  fails the pipeline on any violation.

• .helmignore excludes: *.tgz, *.DS_Store, dist/, test/, .venv/, *.orig, etc.

---

🛠️ Task Checklist

Step	Action
1	Generate JSON Schema • `helm show values .	kubeconform --output jsonschema > values.schema.json*or* usehelm-schema-gen.<br/>• Verify that *all* keys in values.yamlpassajv validate`.
2	Write the Makefile Minimal targets: makefile<br/>.PHONY: lint schema package<br/>lint: schema ## helm lint + yamllint<br/>\thelm lint .<br/>\tyamllint templates/ values.yaml Chart.yaml<br/>schema: ## validate values against JSON schema<br/>tajv validate -s values.schema.json -d values.yaml<br/>package: ## helm package + OCI push<br/>helm package . -d dist/ && helm push dist/*.tgz oci://ghcr.io/ibm/mcp-context-forge<br/>
3	CODEOWNERS
4	CHANGELOG.md Follow Keep-a-Changelog; at minimum add an Unreleased section with Added “schema, Makefile, docs” entries.
5	CONTRIBUTING.md Short bullets: 1. Fork & branch. 2. cd charts/mcp-stack && make lint. 3. Open PR. 4. Chart version bump is mandatory (Chart.yaml → appVersion & version).
6	.helmignore Copy the default from Helm template and extend with project-specific paths (README.md, *.md, docs/, dist/).
7	Wire into CI Add a job (or extend existing package job) that executes make lint inside charts/mcp-stack.
8	Docs touch-up • Add quick links at bottom of README → CONTRIBUTING & CHANGELOG. • Optionally mention the new Make targets in “CI/CD & OCI Push” section.
9	Smoke test ```bash helm lint charts/mcp-stack helm template charts/mcp-stack	kube-val --strict ``` should exit 0.

---

🔄 Alternatives Considered

• Using a single, top-level Makefile for the project - rejected to keep the chart independently buildable.
• Storing the schema in helm-schemas/ – out of scope for now; local file is enough.

---

📓 Additional Notes

• Keep values.schema.json in sync by regenerating it every time you add a new value key.
• If ajv proves too heavy, switch to helm-json-schema-validation GitHub Action—just document the choice in CONTRIBUTING.
• .helmignore rules mirror .gitignore + anything that slows down helm template.

After this chore lands, any contributor can run one command:

cd charts/mcp-stack && make lint

and be confident their change will pass CI the first time.

Additional tools

# Install
go install github.com/norwoodj/helm-docs/cmd/helm-docs@latest

# Generate (creates documentation, not schema)
helm-docs

# Install
npm install -g @json-schema-tools/schema-from-object

# Generate (requires some manual cleanup)
helm template . | yq eval '.spec.template.spec.containers[0].env' | schema-from-object > values.schema.json

# Install
npm install -g json-schema-generator

# Convert values.yaml to JSON first, then generate schema
yq eval -o=json values.yaml | json-schema-generator > values.schema.json