Add project files

00_uebungs-files/03_docker-compose/docker-compose.yml

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+version: '3'
+
+services:
+  nginx:
+    image: nginx:alpine
+    ports:
+      - "8000:80"
+    volumes:
+      - ./src:/var/www/html
+      - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - php
+    networks:
+      - frontend
+      - backend
+
+  php:
+    build:
+      context: ./docker/php
+      dockerfile: Dockerfile
+    volumes:
+      - ./src:/var/www/html
+    environment:
+      - DB_HOST=db
+      - DB_USER=root
+      - DB_PASS=secret
+      - DB_NAME=testdb
+    networks:
+      - backend
+    depends_on:
+      - db
+
+  db:
+    image: mysql:8.0
+    command: --default-authentication-plugin=mysql_native_password
+    environment:
+      - MYSQL_ROOT_PASSWORD=secret
+      - MYSQL_DATABASE=testdb
+    volumes:
+      - db_data:/var/lib/mysql
+    networks:
+      - backend
+
+networks:
+  frontend:
+  backend:
+    internal: true
+
+volumes:
+  db_data: