Use YAML anchors to reuse scripts in Gitlab CI.md


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[[Docker-in-docker]]

**Re-usable scripts** via YAML anchors, `extends` doesn't seem to merge scripts.
```
.devstack-script: &devstack-script
  - echo "${SECURE_YAML}" > secure.yaml
  - echo "${SSH_PRIVATE_KEY}" | base64 -d > ssh-id

blaat:
  script:
    - *devstack-script
    - myscript
```