[stable/cluster-autoscaler] add support for configmap for containers environment variables (#16041)

* add support for configmap for containers environment variables

Signed-off-by: Andrew Johnstone <andrew@ajohnstone.com>

* Support configmaps for cluster-autoscaler

Signed-off-by: Andrew Johnstone <andrew@ajohnstone.com>

stable/cluster-autoscaler/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 description: Scales worker nodes within autoscaling groups.
 icon: https://github.com/kubernetes/kubernetes/blob/master/logo/logo.png
 name: cluster-autoscaler
-version: 3.1.0
+version: 3.2.0
 appVersion: 1.13.1
 home: https://github.com/kubernetes/autoscaler
 sources:

stable/cluster-autoscaler/README.md

@@ -150,6 +150,7 @@ Parameter | Description | Default
 `extraArgs` | additional container arguments | `{}`
 `podDisruptionBudget` | Pod disruption budget | `maxUnavailable: 1`
 `extraEnv` | additional container environment variables | `{}`
+`envFromConfigMap` |  additional container environment variables from a configmap | `[]`
 `envFromSecret` | additional container environment variables from secret | `nil`
 `nodeSelector` | node labels for pod assignment | `{}`
 `podAnnotations` | annotations to add to each pod | `{}`

stable/cluster-autoscaler/templates/deployment.yaml

@@ -142,6 +142,13 @@ spec:
             - name: {{ $key }}
               value: "{{ $value }}"
           {{- end }}
+          {{- range $key, $value := .Values.envFromConfigMap }}
+            - name: {{ $key }}
+              valueFrom:
+                configMapKeyRef:
+                  name: {{ default (include "cluster-autoscaler.fullname" $) $value.name }}
+                  key: {{ required "Must specify key!" $value.key }}
+          {{- end }}
           {{- if .Values.envFromSecret }}
           envFrom:
             - secretRef: