# cancel_pipeline_functions.yml
.cancel_pipeline_template:
  image: alpine:latest
  before_script:
    - apk add --update curl
    - | 
        cancel_pipeline () {
          curl --request POST --header "PRIVATE-TOKEN: ${MY_PAT_TOKEN}" "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/jobs/${CI_JOB_ID}/cancel"
        }

# .gitlab-ci.yml
image: alpine:latest
include: cancel_pipeline_functions.yml

test1:
  stage: test
  extends: .cancel_pipeline_template
  script:
    - echo "This job will cancel the pipeline"
    - cancel_pipeline