[MINOR] Update syntax and deprecated in docker

This commit remove the maxPemSize argument that is no longer
valid in java, for the docker tests used in github actions.

Author: Baunsgaard

docker/entrypoint.sh

@@ -26,7 +26,7 @@ cd /github/workspace/src/main/cpp
 ./build.sh
 cd /github/workspace
 
-export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=128m"
+export MAVEN_OPTS="-Xmx512m"
 
 log="/tmp/sysdstest.log"
 mvn -ntp -B test-compile 2>&1 | grep -E "BUILD|Total time:|---|Building SystemDS"

docker/testsysds.Dockerfile

@@ -73,8 +73,7 @@ RUN apt-get install -y --no-install-recommends \
 		libssl-dev \
 		r-base \
 		r-base-dev \
-		r-base-core\
-    
+		r-base-core \
 	&& Rscript installDependencies.R \
 	&& rm -rf installDependencies.R \
 	&& rm -rf /var/lib/apt/lists/*