gitlab-auto-merge.yaml

# You need create a project access token "Repository -> Settings -> Access Token"
# When you create access token you need to add to the CI/CD variables "Repository -> Settings -> CI/CD -> Expand Variables Section"
# Click to add variable button and set variable name as GITLAB_CI_PUSH_TOKEN then copy your access token value
# Well done after these steps copy and paste following instructions to your .gitlab-ci.yaml file

Merge master into hotfix:
  stage: merge-master-to-hotfix
  needs: ["StageName"]
  before_script:
    - apk update && apk add git
    - git config user.email "gitlab.pipeline@yourrandomemail.com"
    - git config user.name "gitlab-pipeline"
  script:
    - echo "Merge master to hotfix"
    - from=$CI_BUILD_REF_NAME
    - to=hotfix
    - git remote set-url origin $CI_REPOSITORY_URL
    - git fetch --all
    - git checkout $to
    - git merge origin/$from
    - git push -o ci-skip https://$GITLAB_USER_LOGIN:$GITLAB_CI_PUSH_TOKEN@$CI_SERVER_HOST/$CI_PROJECT_PATH.git
  type: deploy
  tags:
    - k8s
  rules:
    - if: '$CI_BUILD_REF_NAME == "master"'
      when: manual
    - when: never

Merge hotfix into master:
  stage: merge-hotfix-to-master
  needs: ["StageName"]
  before_script:
    - apk update && apk add git
    - git config user.email "gitlab.pipeline@yourrandomemail.com"
    - git config user.name "gitlab-pipeline"
  script:
    - from=$CI_BUILD_REF_NAME
    - to=master
    - git remote set-url origin $CI_REPOSITORY_URL
      - git fetch --all
      - git checkout $to
      - git merge origin/$from
      - git push -o ci-skip https://$GITLAB_USER_LOGIN:$GITLAB_CI_PUSH_TOKEN@$CI_SERVER_HOST/$CI_PROJECT_PATH.git
  type: deploy
  tags:
    - k8s
  rules:
    - if: '$CI_BUILD_REF_NAME == "hotfix"'
      when: manual
    - when: never
    
# IF YOUR BRANCH IS PROTECTED USE FOLLOWING STAGE
 Merge hotfix into master:
  stage: merge-hotfix-to-master
  needs: ["StageName"]
  before_script:
    - apk update && apk add --no-cache bash curl grep jq
  variables:
    GIT_STRATEGY: none
  script:
    - from=$CI_BUILD_REF_NAME
    - to=master
    - 'curl --header "PRIVATE-TOKEN: $GITLAB_CI_PUSH_TOKEN" -X POST "https://gitlab.yourdomain.com/api/v4/projects/$CI_PROJECT_ID/merge_requests?source_branch=$from&target_branch=$to&title=Merge%20Request%20Created%20by%20GitlabCI%20via%20Pipeline:%20$CI_PIPELINE_IID&target_project_id=$CI_PROJECT_ID"'
  type: deploy
  tags:
    - k8s
  rules:
    - if: '$CI_BUILD_REF_NAME == "hotfix"'
      when: manual
    - when: never
    
    
# Auto create deployment on New Relic
# Add following curl to script section in your stage

#- 'http_response=$(curl --header "Api-Key: ${NEW_RELIC_API_KEY}" --header "Content-Type: application/json" -X POST -d "{\"deployment\":{ \"revision\": \"REVISION\", \"changelog\": \"Commit ID = $CI_COMMIT_SHORT_SHA\", \"description\": \"PIPELINE ID = $CI_PIPELINE_ID - QA\", \"user\": \"$GITLAB_USER_EMAIL\", \"timestamp\": \"$CI_JOB_STARTED_AT\" }}" "https://api.newrelic.com/v2/applications/${NEW_RELIC_APP_ID_PROD}/deployments.json")'