Add MongoDB initialization script and update deployment configurations

overleaf-helm-chart/templates/service-mongo.yaml

@@ -2,9 +2,18 @@ apiVersion: v1
 kind: Service
 metadata:
   name: mongo
+  namespace: {{ .Values.namespace }}
+  labels:
+    app: mongo
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
 spec:
+  type: ClusterIP
   ports:
     - port: {{ .Values.mongo.port }}
       targetPort: {{ .Values.mongo.port }}
+      protocol: TCP
+      name: mongo
   selector:
     app: mongo