Update Dockerfile

Dockerfile

@@ -9,4 +9,4 @@ RUN ./gradlew --no-daemon fatJar && rm -r gradle/ extendj/ src/ build/ gradlew b
 ENV BOOT_CLASSPATH="/usr/local/openjdk-8/jre/lib/rt.jar"
 VOLUME ["/src"]
 VOLUME ["/data"]
-ENTRYPOINT ["/bin/sh"]
+ENTRYPOINT [""]