Add volume mount for PostgreSQL data

Author: AlfreMu

k8s/portfolio/postgres/deployment.yaml

@@ -22,3 +22,10 @@ spec:
           envFrom:
             - secretRef:
                 name: postgres-secret
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+      volumes:
+        - name: postgres-data
+          persistentVolumeClaim:
+            claimName: postgres-pvc