added volume; changed cmd to entrypoint

Author: bdito

Dockerfile

@@ -3,9 +3,10 @@ FROM java:openjdk-8
 RUN wget -qO- "https://github.com/skavanagh/KeyBox/releases/download/v2.84.00/keybox-jetty-v2.84_00.tar.gz" \
     | tar -xzC /opt
 
-EXPOSE 8443
+EXPOSE 8443/tcp
+VOLUME ["/a/keydb"]
 
 ADD start.sh /a/start.sh
 RUN chmod +x /a/start.sh
 
-CMD ["/a/start.sh"]
+ENTRYPOINT  ["/a/start.sh"]