feat: Feast-operator Helm chart

[mkerkstra]

What this PR does / why we need it:

• Adds an Helm chart to deploy the Feast Operator.
• Includes Deployment, ServiceAccount, RBAC (ClusterRole/Binding plus leader-election Role/Binding), metrics Service, and optional ServiceMonitor (CRD-gated).
• CRD install toggle via crds.install.
• Adds chart metadata (Chart.yaml), values + schema, CHANGELOG, and README.

Which issue(s) this PR fixes:

• NA

Misc

• Tested with helm lint and helm template.
• ArtifactHub annotations included.
  • Happy to help set up an Artifact Hub organization and wire up the charts if that is something y'all would be interested in.

[tchughesiv]

If the community is on board with creating a helm chart for deploying the operator, it should definitely be dynamically built and not require manual changes as the operator evolves. The following tool looks promising and has documented how to integrate with our existing operator-sdk implementation, it's called Helmify -
https://github.com/arttor/helmify?tab=readme-ov-file#integrate-to-your-operator-sdkkubebuilder-project

feast/infra/feast-operator/Makefile

Lines 100 to 101 in acb97fb

	manifests: controller-gen ## Generate WebhookConfiguration, ClusterRole and CustomResourceDefinition objects.
	$(CONTROLLER_GEN) rbac:roleName=manager-role crd:maxDescLen=120 webhook paths="./..." output:crd:artifacts:config=config/crd/bases

feast/infra/feast-operator/Makefile

Lines 244 to 246 in acb97fb

	kustomize: $(KUSTOMIZE) ## Download kustomize locally if necessary.
	$(KUSTOMIZE): $(LOCALBIN)
	$(call go-install-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/v5,$(KUSTOMIZE_VERSION))

That said, the "official" method for managing operator deployment/lifecycle is something called OLM and operator bundles (existing make bundle command) -
https://github.com/operator-framework/operator-lifecycle-manager
https://operatorhub.io/

feast/infra/feast-operator/Makefile

Line 312 in acb97fb

bundle: manifests kustomize related-image-fs operator-sdk ## Generate bundle manifests and metadata, then validate generated files.

However, i understand the convenience and familiarity of helm for folks so something like helmify would also suffice.

[tchughesiv]

does it make more sense to run this here?

feast/infra/feast-operator/Makefile

Lines 190 to 193 in acb97fb

	build-installer: manifests generate-ref kustomize related-image-fs ## Generate a consolidated YAML with CRDs and deployment.
	mkdir -p dist
	cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
	$(KUSTOMIZE) build config/default > dist/install.yaml

[tchughesiv]

it's worth noting that make build-installer is executed with CI for each release, it also similarly already runs kustomize build

[tchughesiv]

remove this file, as its a duplicate of -
https://github.com/feast-dev/feast/blob/master/infra/feast-operator/config/crd/bases/feast.dev_featurestores.yaml

[tchughesiv]

move this and any helm related files to a new dir within the existing infra/charts path -
https://github.com/feast-dev/feast/tree/master/infra/charts

[franciscojavierarceo]

@mkerkstra any update here? I was wondering if you want me to include this in the next release?