Automate the creation of the .gitlab-ci.yml or equivalent via API

Description

Customer may have a big number of projects with complicated processes for CI. They'd like to see the building of CI process definition could be automated by API for faster migration and flexibility.

Proposal

  • API to setup default image globally
  • API to create order of stages
  • API to add jobs to stage
  • API to create/modify job
  • Add/modify script
  • Define/change cache settings
  • Define/change artifact definition
  • Define/change the condition of job

Use cases

  • Faster on-boarding new customer.
  • Programmatically set CI up

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.