Update: Add the possibility to add a Secret to the chart

helm/mail/templates/secret.yaml

@@ -0,0 +1,15 @@
+{{- $chart := "mail" -}}
+{{- $fullName := include (print $chart ".fullname") . -}}
+{{- $labels := include (print $chart ".labels") . -}}
+{{- with .Values.secret }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- $labels | nindent 4 }}
+data:
+  {{- range $key, $value := . }}
+  {{ $key }}: {{ $value | b64enc | quote }}
+  {{- end }}
+{{ end }}

helm/mail/templates/statefulset.yaml

@@ -91,6 +91,10 @@ spec:
           envFrom:
             - configMapRef:
                 name: {{ $fullName | quote }}
+            {{- with .Values.secret }}
+            - secretRef:
+                name: {{ $fullName | quote }}
+            {{- end }}
           {{ with .Values.extraEnv }}env: {{- toYaml . | nindent 12 }}{{ end }}
           volumeMounts:
             - mountPath: /var/spool/postfix

helm/mail/values.yaml

@@ -68,6 +68,10 @@ container:
   postfix:
     securityContext: {}
 
+# Define data which should be stored in a Secret
+# (and shared with the pod as environment variables)
+# secret: {}
+
 config:
   general: {}
     # e.g.

helm/test_5_secret.yml

@@ -0,0 +1,11 @@
+autoscaling:
+  enabled: true
+  maxReplicas: 4
+
+config:
+  general:
+    TZ: Europe/London
+    ALLOWED_SENDER_DOMAINS: example.org
+
+secret:
+  Hello: "World"