add custom metrics autoscaler operator

Author: strangiato

openshift-custom-metrics-autoscaler/README.md

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+# OpenShift Custom Metrics Autoscaler
+
+Install OpenShift Custom Metrics Autoscaler.
+
+Do not use the `base` directory directly, as you will need to patch the `channel` based on the version of OpenShift you are using, or the version of the operator you want to use.
+
+The current *overlays* available are for the following channels:
+
+* [stable](operator/overlays/stable)
+
+## Usage
+
+If you have cloned the `gitops-catalog` repository, you can install Red Hat OpenShift GitOps based on the overlay of your choice by running from the root (`gitops-catalog`) directory.
+
+```
+oc apply -k openshift-custom-metrics-autoscaler/operator/overlays/<channel>
+```
+
+Or, without cloning:
+
+```
+oc apply -k https://github.com/redhat-cop/gitops-catalog/openshift-custom-metrics-autoscaler/operator/overlays/<channel>
+```
+
+As part of a different overlay in your own GitOps repo:
+
+```
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - https://github.com/redhat-cop/gitops-catalog/openshift-custom-metrics-autoscaler/operator/overlays/<channel>?ref=main
+```

openshift-custom-metrics-autoscaler/operator/base/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: openshift-keda
+
+resources:
+  - namespace.yaml
+  - subscription.yaml

openshift-custom-metrics-autoscaler/operator/base/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: openshift-keda
+  annotations:
+    openshift.io/display-name: "OpenShift Keda Operator"
+  labels:
+    openshift.io/cluster-monitoring: 'true'

openshift-custom-metrics-autoscaler/operator/base/operatorgroup.yaml

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+apiVersion: operators.coreos.com/v1
+kind: OperatorGroup
+metadata:
+  name: openshift-keda
+  namespace: openshift-keda
+spec: {}

openshift-custom-metrics-autoscaler/operator/base/subscription.yaml

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+apiVersion: operators.coreos.com/v1alpha1
+kind: Subscription
+metadata:
+  name: openshift-custom-metrics-autoscaler-operator
+spec:
+  channel: patch-me-see-overlays-dir
+  installPlanApproval: Automatic
+  name: openshift-custom-metrics-autoscaler-operator
+  source: redhat-operators
+  sourceNamespace: openshift-marketplace

openshift-custom-metrics-autoscaler/operator/overlays/stable/kustomization.yaml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+
+resources:
+  - ../../base
+patches:
+  - path: patch-channel.yaml
+    target:
+      group: operators.coreos.com
+      kind: Subscription
+      version: v1alpha1

openshift-custom-metrics-autoscaler/operator/overlays/stable/patch-channel.yaml

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+- op: replace
+  path: /spec/channel
+  value: 'stable'