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Pre-built Docker images for CI

Description

We let people bring their own Docker images for CI, which is great, but we make users do all the work to make these complete enough to run their builds and tests. We should consider providing pre-built environments that cover the 90% case. We have a separate issue about a kitchen-sink image (gitlab-ce#21626), but this issue is more about language-specific, efficient images.

Proposal

Create pre-built images for:

  • Clojure
  • Elixir
  • Go (golang)
  • Java
  • Node.js
  • PHP
  • Python
  • Ruby

Also consider images for common database services that might be optimized better, or more complete, than stock database images:

  • MongoDB
  • MySQL
  • PostgreSQL

Links / references

Documentation blurb

Overview

What is it? Why should someone use this feature? What is the underlying (business) problem? How do you use this feature?

Use cases

Who is this for? Provide one or more use cases.

Feature checklist

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

Edited by Mark Pundsack