Merge pull request wnameless#122 from marcosvidolin/master

Adding Dockerfile Best Practices

Author: wnameless

Dockerfile

@@ -1,12 +1,10 @@
 FROM ubuntu:18.04
 
-MAINTAINER Wei-Ming Wu <wnameless@gmail.com>
-
-ADD assets /assets
+COPY assets /assets
 RUN /assets/setup.sh
 
 EXPOSE 22
 EXPOSE 1521
 EXPOSE 8080
 
-CMD /usr/sbin/startup.sh && tail -f /dev/null
+CMD /usr/sbin/startup.sh && tail -f /dev/null