Updated for 1.4.0

Added line "export OPENSSL_CONF=/dev/null && \" otherwise it wouldn't compile.
Found out why here "bazelbuild/rules_closure#351"

Also VERSION variable was not working on the copy command. Added "ARG VERSION"

Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:latest as stage1
 LABEL maintainer="John Burt"
 
 ENV DEBIAN_FRONTEND=noninteractive
-ARG VERSION=1.3.0
+ARG VERSION=1.4.0
 
 RUN \
  echo "**** install packages ****" && \
@@ -11,13 +11,15 @@ RUN \
  wget http://archive.apache.org/dist/guacamole/${VERSION}/source/guacamole-client-${VERSION}.tar.gz && \
  tar -xzf guacamole-client-${VERSION}.tar.gz && \
  cd guacamole-client-${VERSION}/ && \
+ export OPENSSL_CONF=/dev/null && \
  export JAVA_HOME=$(realpath /usr/bin/javadoc | sed 's@bin/javadoc$@@') && \
  mvn clean package -Plgpl-extensions && \
  echo $PWD
 
 
 FROM alpine:latest
+ARG VERSION
 
 COPY --from=stage1 /guacamole-client-${VERSION}/extensions/guacamole-auth-radius/target/guacamole-auth-radius-${VERSION}.jar /guacamole-auth-radius-${VERSION}.jar
 
-ENTRYPOINT ["/bin/sh"]
+ENTRYPOINT ["/bin/sh"]