Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -32,7 +32,7 @@ est_build_test_job:
     stage: build_est
     environment: staging
     script:
-    - "curl -X POST -F token=d1ce830095dc9201851e948eb160f4 -F ref=mavenize_project https://gitlab.fbk.eu/api/v4/projects/1159/trigger/pipeline"
+    - "curl -X POST -F token=d1ce830095dc9201851e948eb160f4 -F ref=master https://gitlab.fbk.eu/api/v4/projects/1159/trigger/pipeline"
 
 build_test_job:
     stage: test