Environment value merge failed with multiple docker-compose files

[neeon-li]

This may relate to Issue #968.

Environment value is unable to merge and replaced by the last docker-compose file.
Merge with command kompose convert -o dev-out.yaml -f base.yaml -f dev.yaml

base.yaml

version: '3'

services:
  web:
    image: richarvey/nginx-php-fpm
    environment:
      - ERRORS=0
      - HIDE_NGINX_HEADERS=0
      - REMOVE_FILES=0
      - RUN_SCRIPTS=0
      - PHP_ERRORS_STDERR=0
      - ENABLE_XDEBUG=0

dev.yaml

version: '3'

services:
  web:
    environment:
      - ERRORS=1
      - HIDE_NGINX_HEADERS=0
      - REMOVE_FILES=0
      - RUN_SCRIPTS=1
      - PHP_ERRORS_STDERR=1
      - ENABLE_XDEBUG=1

But the dev-out.yaml shows

apiVersion: v1
items:
- apiVersion: v1
  kind: Service
  metadata:
    annotations:
      kompose.cmd: kompose convert -o dev-out.yaml -f base.yaml -f dev.yaml
      kompose.version: 1.11.0 ()
    creationTimestamp: null
    labels:
      io.kompose.service: web
    name: web
  spec:
    clusterIP: None
    ports:
    - name: headless
      port: 55555
      targetPort: 0
    selector:
      io.kompose.service: web
  status:
    loadBalancer: {}
- apiVersion: extensions/v1beta1
  kind: Deployment
  metadata:
    annotations:
      kompose.cmd: kompose convert -o dev-out.yaml -f base.yaml -f dev.yaml
      kompose.version: 1.11.0 ()
    creationTimestamp: null
    labels:
      io.kompose.service: web
    name: web
  spec:
    replicas: 1
    strategy: {}
    template:
      metadata:
        creationTimestamp: null
        labels:
          io.kompose.service: web
      spec:
        containers:
        - env:
          - name: ENABLE_XDEBUG
            value: "0"
          - name: ERRORS
            value: "0"
          - name: HIDE_NGINX_HEADERS
            value: "0"
          - name: PHP_ERRORS_STDERR
            value: "0"
          - name: REMOVE_FILES
            value: "0"
          - name: RUN_SCRIPTS
            value: "0"
          image: richarvey/nginx-php-fpm
          name: web
          resources: {}
        restartPolicy: Always
  status: {}
kind: List
metadata: {}

The environment value of the container is unable to replace by the dev.yaml.

[hangyan]

close by #990