Add deployment.replicas helm value (#465)

Discussed in aws-controllers-k8s/community#1890 (comment) 

Add `deployment.replicas` helm value

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: a-hilaly

templates/helm/templates/deployment.yaml

@@ -11,7 +11,7 @@ metadata:
     k8s-app: {{ include "app.name" . }}
     helm.sh/chart: {{ include "chart.name-version" . }}
 spec:
-  replicas: 1
+  replicas: {{ .Values.deployment.replicas }}
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ include "app.name" . }}

templates/helm/values.schema.json

@@ -47,6 +47,9 @@
           "minimum": 1,
           "maximum": 65535
         },
+        "replicas": {
+          "type": "integer"
+        },
         "nodeSelector": {
           "type": "object"
         },

templates/helm/values.yaml.tpl

@@ -15,6 +15,10 @@ deployment:
   annotations: {}
   labels: {}
   containerPort: 8080
+  # Number of Deployment replicas
+  # This determines how many instances of the controller will be running. It's recommended
+  # to enable leader election if you need to increase the number of replicas > 1
+  replicas: 1
   # Which nodeSelector to set?
   # See: https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#nodeselector
   nodeSelector: