Run merge request pipelines instead of two different ones

.gitlab-ci.yml

@@ -10,6 +10,14 @@ stages:
   - test
   - deploy
 
+# https://git.pleroma.social/help/ci/yaml/workflow.md#switch-between-branch-pipelines-and-merge-request-pipelines
+workflow:
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    - if: $CI_COMMIT_BRANCH && $CI_OPEN_MERGE_REQUESTS
+      when: never
+    - if: $CI_COMMIT_BRANCH
+
 check-changelog:
   stage: check-changelog
   image: alpine