Pod's own IP address from inside a container in the Pod

Former-commit-id: 3e614efa89e3d3c9fca4b7adcd3a27e57508632c

ci/jenkins/pod/milvus-build-env-pod.yaml

@@ -25,6 +25,10 @@ spec:
     env:
     - name: MYSQL_ROOT_PASSWORD
       value: 123456
+    - name: POD_IP
+          valueFrom:
+            fieldRef:
+              fieldPath: status.podIP
     ports:
     - containerPort: 3306
       name: mysql