Update .gitlab-ci.yml

.gitlab-ci.yml

 variables:
   #DOCKER_USER: javicorvi
   #DOCKER_BUILD: $DOCKER_USER/$CI_PROJECT_NAME:$CI_COMMIT_REF_NAME
+  
   DOCKER_REGISTRY: registry.gitlab.bsc.es
-  IMAGE_FULL_PATH: $DOCKER_REGISTRY/$CI_PROJECT_NAME:$CI_COMMIT_REF_NAME
+  #any doubts regarind gitlab ci cd enviroment variables go to 
+  #https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
+  IMAGE_FULL_PATH: $DOCKER_REGISTRY/$CI_PROJECT_PATH:$CI_COMMIT_REF_NAME
 stages:
   - build
 build_docker_image: