How to reuse job in .gitlab-ci.yml

Question

I currently have two jobs in my CI file which are nearly identical.

The first is for manually compiling a release build from any git branch.

deploy_internal:
  stage: deploy
  script: ....<deploy code>
  when: manual

The second is to be used by the scheduler to release a daily build from develop branch.

scheduled_deploy_internal:
  stage: deploy
  script: ....<deploy code from deploy_internal copy/pasted>
  only: 
      variables:
          - $MY_DEPLOY_INTERNAL != null

This feels wrong to have all that deploy code repeated in two places. It gets worse. There are also deploy_external, deploy_release, and scheduled variants.

My question: Is there a way that I can combine deploy_internal and scheduled_deploy_internal such that the manual/scheduled behaviour is retained (DRY basically)?

Alternatively: Is there is a better way that I should structure my jobs?

Edit:
Original title: Deploy job. Execute manually except when scheduled

Answer 1

You can use YAML anchors and aliases to reuse the script.

deploy_internal:
  stage: deploy
  script:
    - &deployment_scripts |
      echo "Deployment Started"
      bash command 1
      bash command 2
  when: manual

scheduled_deploy_internal:
  stage: deploy
  script:
    - *deployment_scripts
  only:
    variables:
      - $MY_DEPLOY_INTERNAL != null

Or you can use extends keyword.

.deployment_script:
  script:
    - echo "Deployment started"
    - bash command 1
    - bash command 2

deploy_internal:
  extends: .deployment_script
  stage: deploy
  when: manual

scheduled_deploy_internal:
  extends: .deployment_script
  stage: deploy
  only:
    variables:
      - $MY_DEPLOY_INTERNAL != null