Test to retreive value of CI_MERGE_REQUEST_PROJECT_PATH

.gitlab-ci.yml

 variables:
   DOCKER_DRIVER: overlay2
+  SITE_NAME: $CI_MERGE_REQUEST_PROJECT_PATH
 
 stages:
   - build
@@ -16,7 +17,7 @@ natif-build:
   stage: build
   image: registry.orfeo-toolbox.org/sdinot/otb:ubuntu-18.04-gccV0.2
   script:
-    - echo ${CI_MERGE_REQUEST_PROJECT_PATH}
+    - echo ${SITE_NAME}
 #    - ctest -VV -S CI/main_ci.cmake \
 #      "-DCTEST_SITE:string=${CI_MERGE_REQUEST_PROJECT_PATH}_ubuntu-18.04"
 
@@ -25,6 +26,6 @@ shark-build:
   stage: build
   image: registry.orfeo-toolbox.org/sdinot/otb:ubuntu18.04-shark3.1.4
   script:
-    - echo $CI_MERGE_REQUEST_PROJECT_PATH
+    - echo $SITE_NAME
     # - ctest -VV -S CI/main_ci.cmake \
     #   -DCTEST_SITE:string=${CI_MERGE_REQUEST_PROJECT_PATH}_ubuntu18.04-shark3.1.4
\ No newline at end of file