CI/CD for third party hosted projects

Description

Create CI and CD jobs and pipelines for projects hosted outside the GitLab instance.

Proposal

Add a feature that lets users define CI/CD jobs and pipelines that run in response to signals from third party platforms. Like a webhook call from GitHub.

Links / references

Documentation blurb

Overview

What is it?

See description?

Why should someone use this feature?

To take advantage of GitLab-CI's feature set while still meeting the project needs that mean the project can't be hosted on GitLab itself.

What is the underlying (business) problem?

At work, our internal projects are hosted on an internal instance of Gitlab-CE. But we also have multiple open sourced projects hosted on GitHub. CI/CD for projects hosted on GitHub requires use of a non-GitLab CI/CD tool.

How do you use this feature?

To run CI/CD tasks for projects hosted on third party platforms like GitHub.

Use cases

A project is hosted on GitHub to enable collaboration outside a business, but the business still deploys the project to internal servers.

A company uses a non-git source control system but needs a solid CI/CD platform.

Feature checklist

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