Update Dockerfile

Dockerfile

@@ -1,7 +1,9 @@
 FROM maven:3.8.1-adoptopenjdk-11
 MAINTAINER Goudham Suresh
 
+RUN ls -la
+
 RUN apt-get -y update && \
     apt-get -y upgrade && \
     apt-get -y dist-upgrade && \
-    apt-get -y install gpg
+    apt-get -y install gpg