trigger pipelines for merge request branches
Add $CI_MERGE_REQUEST_IID to .gitlab-ci.yml as in https://gitlab.gwdg.de/sepia/content-parser/-/blob/1-set-up-deployment/.gitlab-ci.yml#L30 to trigger pipelines for merge request branches.
Add $CI_MERGE_REQUEST_IID to .gitlab-ci.yml as in https://gitlab.gwdg.de/sepia/content-parser/-/blob/1-set-up-deployment/.gitlab-ci.yml#L30 to trigger pipelines for merge request branches.