Prevent detached pipeline on MR

.gitlab-ci.yml

@@ -36,6 +36,11 @@ latest-spec:
   image: python:3.10
   stage: test
   script:
-  - pip install -r ./scripts/requirements.txt
-  - ./pull-specs.sh --token ${GITLAB_PULL_SPECS_TOKEN}
-  - git diff --exit-code
+    - pip install -r ./scripts/requirements.txt
+    - ./pull-specs.sh --token ${GITLAB_PULL_SPECS_TOKEN}
+    - git diff --exit-code
+  rules:
+    # Don't create a detached job on a merge request - a separate pipeline
+    # should be created for a branch which is where we expect this to be run
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+      when: never