✨ Add support for deploying OCI helm charts in OLM v1 (#1971)

* Add support for deploying OCI helm charts in OLM v1

* added support for deploying OCI helm charts which sits behind
the HelmChartSupport feature gate
* extend the Cache Store() method to allow storing of Helm charts
* inspect chart archive contents
* added MediaType to the LayerData struct

Signed-off-by: Edmund Ochieng <ochienged@gmail.com>

* Helm chart support documentation

Signed-off-by: Edmund Ochieng <ochienged@gmail.com>

* add overlays for Helm Chart experimental features

Signed-off-by: Edmund Ochieng <ochienged@gmail.com>

---------

Signed-off-by: Edmund Ochieng <ochienged@gmail.com>

Author: OchiengEd

config/components/base/experimental/kustomization.yaml

@@ -13,5 +13,6 @@ components:
 - ../../features/single-own-namespace
 - ../../features/preflight-permissions
 - ../../features/apiv1-metas-handler
+- ../../features/helm-chart
 # This one is downstream only, so we shant use it
 # - ../../features/webhook-provider-openshift-serviceca

config/components/features/helm-chart/kustomization.yaml

@@ -0,0 +1,9 @@
+# DO NOT ADD A NAMESPACE HERE
+---
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+patches:
+ - target:
+      kind: Deployment
+      name: operator-controller-controller-manager
+   path: patches/enable-featuregate.yaml

config/components/features/helm-chart/patches/enable-featuregate.yaml

@@ -0,0 +1,4 @@
+# enable Helm chart support feature gate
+- op: add
+  path: /spec/template/spec/containers/0/args/-
+  value: "--feature-gates=HelmChartSupport=true"