fix music command and add dockerfile

Dockerfile

@@ -0,0 +1,17 @@
+FROM gradle:8.9-jdk17 AS builder
+
+WORKDIR /app
+
+COPY . .
+
+RUN gradle build --no-daemon
+
+FROM openjdk:17-jdk-slim
+
+WORKDIR /app
+
+COPY --from=builder /app/build/libs/*.jar /app/app.jar
+
+EXPOSE 8000
+
+CMD ["java", "-jar", "/app/app.jar"]