[MINOR] Fix POM for jacoco skipping

This commit changes the Pom file to not execute any of the test steps
while building the project per default.

to enable tests use the flag '-D maven.test.skip=false'.
to enable code coverage use also the flag '-D jacoco..skip=false'

As a nice bonus, the time to package the project is reduced by ~50%
diff --git a/.github/workflows/componentTests.yml b/.github/workflows/componentTests.yml
index 195fb5c..820a156 100644
--- a/.github/workflows/componentTests.yml
+++ b/.github/workflows/componentTests.yml
@@ -48,14 +48,11 @@
         restore-keys: |
           ${{ runner.os }}-maven-
 
-    - name: Maven clean compile & test-compile
-      run: mvn clean compile test-compile
-
     - name: Component Tests
       run: |
         log="/tmp/sysdstest.log"
         echo "Starting Tests"
-        mvn surefire:test -DskipTests=false -Dtest=org.apache.sysds.test.component.*.** 2>&1 > $log
+        mvn test -D maven.test.skip=false -Dtest=org.apache.sysds.test.component.*.** 2>&1 > $log
         grep_args="SUCCESS"
         grepvals="$( tail -n 100 $log | grep $grep_args)"
         if [[ $grepvals == *"SUCCESS"* ]]; then
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index fd80cbe..fc511d1 100755
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -24,20 +24,11 @@
 
 cd /github/workspace
 
-build="$(mvn -T 2 clean compile test-compile | grep 'BUILD')"
-
-if [[ $build == *"SUCCESS"* ]]; then
-  echo "Successfull build"
-else
-  echo "failed building"
-  exit 1
-fi
-
 log="/tmp/sysdstest.log"
 
 echo "Starting Tests"
 
-mvn surefire:test -DskipTests=false -Dtest=$1 2>&1 > $log
+mvn test -D maven.test.skip=false -Dtest=$1 2>&1 > $log
 
 grep_args="SUCCESS"
 grepvals="$( tail -n 100 $log | grep $grep_args)"
diff --git a/pom.xml b/pom.xml
index a5e5f92..0fa1a1b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,7 +51,8 @@
 		<jcuda.scope>provided</jcuda.scope>
 		<jcuda.version>10.2.0</jcuda.version>
 		<!-->Testing settings<!-->
-		<skipTests>true</skipTests>
+		<maven.test.skip>true</maven.test.skip>
+		<jacoco.skip>true</jacoco.skip>
 		<argLine>-Xms4g -Xmx4g -Xmn400m</argLine>
 	</properties>
 
@@ -256,7 +257,7 @@
 				<artifactId>maven-surefire-plugin</artifactId>
 				<version>3.0.0-M4</version><!--$NO-MVN-MAN-VER$ -->
 				<configuration>
-					<skipTests>${skipTests}</skipTests>
+					<skipTests>${maven.test.skip}</skipTests>
 					<parallel>classes</parallel>
 					<!-- <useUnlimitedThreads>true</useUnlimitedThreads> -->
 					<threadCount>12</threadCount>