added junit jars

Dockerfile

@@ -14,6 +14,9 @@ run mkdir -p $TESTDIR \
 add target/dtt-openjdk11-junit5-runner-jar-with-dependencies.jar /$BASEDIR/app.jar
 add https://repo1.maven.org/maven2/org/junit/jupiter/junit-jupiter-api/5.7.0/junit-jupiter-api-5.7.0.jar /$LIBSDIR/
 add https://repo1.maven.org/maven2/org/junit/jupiter/junit-jupiter-engine/5.7.0/junit-jupiter-engine-5.7.0.jar /$LIBSDIR/
+add https://repo1.maven.org/maven2/org/junit/jupiter/junit-platform-engine/1.7.0/junit-platform-engine-1.7.0.jar /$LIBSDIR/
+add https://repo1.maven.org/maven2/org/junit/jupiter/junit-platform-commons/1.7.0/junit-platform-commons-1.7.0.jar /$LIBSDIR/
+add https://repo1.maven.org/maven2/org/junit/jupiter/junit-platform-launcher/1.7.0/junit-platform-launcher-1.7.0.jar /$LIBSDIR/
 add https://repo1.maven.org/maven2/org/apiguardian/apiguardian-api/1.1.1/apiguardian-api-1.1.1.jar /$LIBSDIR/
 add https://repo1.maven.org/maven2/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar /$LIBSDIR/