Fix the upload of the unit test results

We expect the file to be named per matrix job but this was not updated
in the code so the upload action couldn't find the files.

Author: vmcj

.github/jobs/unit-tests.sh

@@ -36,7 +36,7 @@ php $phpcov webapp/bin/phpunit -c webapp/phpunit.xml.dist webapp/tests/$unittest
 UNITSUCCESS=$?
 
 # Store the unit tests also in the root for the GHA
-cp $ARTIFACTS/unit-tests.xml $DIR/
+cp $ARTIFACTS/unit-tests.xml $DIR/unit-tests-${version}-${unittest}.xml
 
 # Make sure the log exists before copy
 touch ${DIR}/webapp/var/log/test.log