Change postgres mount dir and pgdata to make persistent data work

gitlab-config.yml

@@ -13,6 +13,7 @@ data:
   mattermost_app_uid: aadas
   postgres_user: gitlab
   postgres_db: gitlab_production
+  postgres_pgdata: /var/lib/postgresql/data/pgdata
 ---
 apiVersion: v1
 kind: Secret

gitlab/postgresql-deployment.yml

@@ -32,11 +32,16 @@ spec:
               key: postgres_db
         - name: DB_EXTENSION
           value: pg_trgm
+        - name: PGDATA
+          valueFrom:
+            configMapKeyRef:
+              name: gitlab-config
+              key: postgres_pgdata
         ports:
         - name: postgres
           containerPort: 5432
         volumeMounts:
-        - mountPath: /var/lib/postgresql
+        - mountPath: /var/lib/postgresql/data
           name: data
         - mountPath: /docker-entrypoint-initdb.d
           name: initdb