Custom plugin using configmap not working as expected

Kubernetes
4

After updating the YAML finally custom pluing get install but after that got next issue. Now same POD, Deployment and Replicaset throwing “CrashloopOff”. After checking the log of the pod we got following error.

init_by_lua error: /usr/local/share/lua/5.1/kong/init.lua:389: [PostgreSQL error] failed to retrieve PostgreSQL server_version_num: connection refused stack traceback:

However Updated YAML is

apiVersion: apps/v1
kind: Deployment
metadata:
name: kong-ingress-custom-plugin
namespace: konga-test
spec:
selector:
matchLabels:
app: konga-test
replicas: 1
template:
metadata:
name: kong-ingress-custom-plugin
labels:
app: kong-ingress-custom-plugin
spec:
containers:
name: proxy
image: ‘kong:2.0’
volumeMounts:
- name: kong-plugin-custom-auth
mountPath: /opt/kong/plugins/kong-plugin-custom-auth
- env:
- name: KONG_PG_DATABASE
value: kong
- name: KONG_PG_HOST
value: postgres
- name: KONG_PG_PORT
value: ‘5432’
- name: KONG_PG_PASSWORD
value: kong
- name: KONG_PG_USER
value: kong
- name: KONG_LOG_LEVEL
value: info
- name: KONG_PLUGINS
value: ‘bundled,kong-plugin-custom-auth’
- name: KONG_LUA_PACKAGE_PATH
value: /etc/?./opt/?.lua;;
volumes:
- defaultMode: 755
- name: kong-plugin-custom-auth
configMap:
name: kong-plugin-custom-auth

Kindly Guild /assist, what i am doing wrong. helps will really appreciated.

Thanks & Regards
Jaiswar Vipin Kumar R.