envsubst for nginx

docker-compose.yml

version: "3"
services:
  web:
    build: nginx
    volumes:
        - ${SITE_DIR}:/var/www/${SITE_NAME}
        - ./nginx/frontend.template:/etc/nginx/conf.d/frontend.template
        - ./data/var/log/nginx:/var/log/nginx
        - ./data/var/log/nginx/${SITE_NAME}:/var/log/nginx/${SITE_NAME}
        - /etc/localtime:/etc/localtime:ro
        - /etc/timezone:/etc/timezone:ro
    environment:
      - SITE_NAME=${SITE_NAME}
      - FRONTEND_DIR=${FRONTEND_DIR}
      - FRONTEND_HOST=${FRONTEND_HOST}
      - FRONTEND_PORT=${FRONTEND_PORT}
    command: /bin/bash -c "envsubst \"`env | awk -F = '{printf \" $$%s\", $$1}'`\" < /etc/nginx/conf.d/frontend.template > /etc/nginx/conf.d/site.conf && exec nginx -g 'daemon off;'"
    ports:
        - 80:80
#        - 443:443
    depends_on:
      - php
    networks:
      - frontend
      - backend