feat: Add extraEnvs to operator helm chart (#2671)

Signed-off-by: Cédric de Saint Martin <cdesaintmartin@wiremind.io>

charts/postgres-operator/templates/deployment.yaml

@@ -52,6 +52,9 @@ spec:
       {{- if .Values.controllerID.create }}
         - name: CONTROLLER_ID
           value: {{ template "postgres-operator.controllerID" . }}
+      {{- end }}
+      {{- if .Values.extraEnvs }}
+      {{- .Values.extraEnvs | toYaml | nindent 12 }}
       {{- end }}
         resources:
 {{ toYaml .Values.resources | indent 10 }}

charts/postgres-operator/values.yaml

@@ -478,7 +478,7 @@ priorityClassName: ""
 # priority class for database pods
 podPriorityClassName:
   # If create is false with no name set, no podPriorityClassName is specified.
-  # Hence, the pod priorityClass is the one with globalDefault set. 
+  # Hence, the pod priorityClass is the one with globalDefault set.
   # If there is no PriorityClass with globalDefault set, the priority of Pods with no priorityClassName is zero.
   create: true
   # If not set a name is generated using the fullname template and "-pod" suffix
@@ -504,6 +504,24 @@ readinessProbe:
   initialDelaySeconds: 5
   periodSeconds: 10
 
+# configure extra environment variables
+# Extra environment variables are writen in kubernetes format and added "as is" to the pod's env variables
+# https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/
+# https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#environment-variables
+extraEnvs:
+  []
+  # Exemple of settings maximum amount of memory / cpu that can be used by go process (to match resources.limits)
+  # - name: MY_VAR
+  #   value: my-value
+  # - name: GOMAXPROCS
+  #   valueFrom:
+  #     resourceFieldRef:
+  #       resource: limits.cpu
+  # - name: GOMEMLIMIT
+  #   valueFrom:
+  #     resourceFieldRef:
+  #       resource: limits.memory
+
 # Affinity for pod assignment
 # Ref: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity
 affinity: {}