replace trigger by rule

.gitlab-ci.yml

@@ -39,8 +39,8 @@ default:
 update_build:
   stage: build
   image: docker:stable
-  only:
-    - triggers
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "pipeline" && $CI_UPSTREAM_PROJECT == "anthony.sonrel/orchestrator-test"'
   before_script:
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN http://$CI_REGISTRY
   script: 
@@ -54,8 +54,8 @@ run_udpate:
   image: 
     name: ${CI_REGISTRY_IMAGE}:latest
     entrypoint: [""]
-  only:
-    - triggers
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "pipeline" && $CI_UPSTREAM_PROJECT == "anthony.sonrel/orchestrator-test"'
   before_script:
     - git config --global user.name "Anthony Sonrel"
     - git config --global user.email "anthony.sonrel@uzh.ch"