Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -2,6 +2,16 @@ stages:
   - demo
 
 ############ YAML ANCHORS ############
+.print_variables_template: &print_variables_definition
+  # Print variables
+  - echo $CI_COMMIT_BRANCH
+  - echo $WOLF_IMU_BRANCH
+  - echo $WOLF_GNSS_BRANCH
+  - echo $GNSSUTILS_BRANCH
+  - echo $WOLF_ROS_NODE_BRANCH
+  - echo $WOLF_ROS_IMU_BRANCH
+  - echo $WOLF_ROS_GNSS_BRANCH
+
 .preliminaries_template: &preliminaries_definition
   ## Install ssh-agent if not already installed, it is required by Docker.
   ## (change apt-get to yum if you use an RPM-based image)