MySQL support

docker-compose.yaml

@@ -1,8 +1,33 @@
 version: "3.9"
 services:
+  mysql:
+    image: mysql:8.0
+    container_name: maillist-mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
+      MYSQL_DATABASE: ${MYSQL_DATABASE:-maillist}
+      MYSQL_USER: ${MYSQL_USER:-maillist}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
+    volumes:
+      - mysql_data:/var/lib/mysql
+      - ./database/schema.sql:/docker-entrypoint-initdb.d/schema.sql
+    ports:
+      - "3307:3306"
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
   postfix:
     build: ./postfix
     container_name: postfix
     env_file: .env
+    depends_on:
+      mysql:
+        condition: service_healthy
     ports:
       - "25:25"
+
+volumes:
+  mysql_data: