add env items to docker-library build

convert .env item to json:
1. W9_*_SET item
2. json format
{
    "wordpress": {
        "W9_HTTP_PORT_SET": 9001,
        "W9_HTTPS_PORT_SET": 9443
    },
    "zentao": {
        "W9_HTTP_PORT_SET": 9002
    }
}