Dockerfile: use tini

Author: jochen-testingbot

Dockerfile

@@ -1,12 +1,12 @@
 FROM openjdk:11.0.16-jre-slim
 LABEL author="TestingBot <[email protected]>"
 
-RUN apt-get update && apt-get install -y wget unzip && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y wget unzip tini && rm -rf /var/lib/apt/lists/*
 
 ARG TUNNEL=testingbot-tunnel
 
 RUN wget https://testingbot.com/downloads/${TUNNEL}.zip \
     && unzip ${TUNNEL}.zip \
     && rm ${TUNNEL}.zip
 
-ENTRYPOINT ["java", "-jar", "testingbot-tunnel.jar"]
+ENTRYPOINT ["/usr/bin/tini", "--", "java", "-jar", "testingbot-tunnel.jar"]