fix: docker镜像无法显示二维码

Dockerfile

@@ -1,4 +1,5 @@
 FROM openjdk:11-jre-slim
+RUN apt update && apt install -y libfreetype6 fontconfig
 WORKDIR /app
 ADD iot-starter/target/iot-starter-0.4.5-SNAPSHOT.jar /app/app.jar
 ADD data/init /app/data/init