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gitlab ci run pipeline only when new merge request created

Gitlab CI only run on Merge Request
To configure pipelines for merge requests, 
add the only: [merge_requests] parameter to 
the jobs that you want to run only for merge requests. 
Then, when developers create or update merge requests, 
a pipeline runs every time a commit is pushed to GitLab.

merge when pipeline succeeds gitlab

enable_merge:
  only: [merge_requests]
  script:
    - echo true

run a pipeline when merge request was created on gitlab

workflow:
    rules:
        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
        - if: $CI_COMMIT_BRANCH == "main" && $CI_PIPELINE_SOURCE == "push"

job1:
  script:
    - echo "This job runs in merge request and also after merge to main branch"

GitLab - Merge When Pipeline Succeeds

# mwps BRANCHNAME
alias mwps='git push -u origin -o merge_request.create -o merge_request.target=main -o merge_request.merge_when_pipeline_succeeds'