Update to use MySQL Database

docker-compose.yml

@@ -1,15 +1,37 @@
 services:
+  mysql:
+    image: mysql:8.0
+    container_name: walkies-mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: walkies
+      MYSQL_USER: walkies
+      MYSQL_PASSWORD: walkies-password
+    ports:
+      - "3306:3306"
+    volumes:
+      - walkies-mysql-data:/var/lib/mysql
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      timeout: 20s
+      retries: 10
+
   walkies:
     build: .
     ports:
       - "8080:8080"
-    volumes:
-      - walkies-data:/app/data
+    depends_on:
+      mysql:
+        condition: service_healthy
     environment:
-      DATABASE_DSN: /app/data/walkies.db
+      DB_HOST: mysql
+      DB_PORT: "3306"
+      DB_USER: walkies
+      DB_PASSWORD: walkies-password
+      DB_NAME: walkies
       JWT_SECRET: change-me-in-production
       PORT: "8080"
       STATIC_DIR: /app/web/dist
 
 volumes:
-  walkies-data:
+  walkies-mysql-data: