Add api endpoint for creating a pipeline (!7209) · Merge Requests · GitLab.org / GitLab FOSS

Add api endpoint for creating a pipeline

What does this MR do?

It adds a new endpoint for creating a pipeline.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

To enable a user to explicitly create a pipeline and receive back its details.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

CHANGELOG entry added
Documentation created/updated
API support added
Tests
- Added for this feature/bug
- All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with master (if it does - rebase it please)
Squashed related commits together

What are the relevant issue numbers?

Fixes #23468 (closed)

## What does this MR do?

It adds a new endpoint for creating a pipeline.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

To enable a user to explicitly create a pipeline and receive back its details.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Fixes #23468