[ci] Add some info output

.gitlab-ci/default.yml

@@ -32,6 +32,7 @@ select tests:
       if [[ -n "$DUMUX_MR_SOURCE_BRANCH" ]]; then
           echo "Fetching upstream branches related to merge request."
           echo "Source branch: $DUMUX_MR_SOURCE_BRANCH"
+          echo "Source project path: $DUMUX_MR_SOURCE_PROJECT_PATH"
           echo "Target branch: $DUMUX_MR_TARGET_BRANCH"
 
           git clone -b ${DUMUX_MR_SOURCE_BRANCH} --depth 1 https://gitlab-ci-token:${CI_JOB_TOKEN}@git.iws.uni-stuttgart.de/${DUMUX_MR_SOURCE_PROJECT_PATH} ${DUMUX_FOLDER}