Add Docker with MariaDB support

- Dockerfile now includes MariaDB server
- Add docker-entrypoint.sh to initialize DB, create user, and set permissions
- docker-compose.yml with configurable environment variables
- Nginx config proxies API to backend

docker-compose.yml

@@ -6,9 +6,10 @@ services:
     ports:
       - "8077:80"
       - "4000:4000"
-    volumes:
-      - hospital-data:/app
-    restart: unless-stopped
-
-volumes:
-  hospital-data:
+    environment:
+      - DB_HOST=localhost
+      - DB_PORT=3306
+      - DB_USER=hospital
+      - DB_PASSWORD=hospital123
+      - DB_NAME=hospital
+    restart: unless-stopped