**app/controllers/projects/settings/ci_cd_controller.rb:**

Supports `:forward_deployment_enabled` as part of the nested
`ci_cd_settings_attributes` property.

**app/models/project.rb:**
**app/models/deployment.rb:**
**app/views/projects/settings/ci_cd/_form.html.haml:**

Use a `ci` prefix for the `forward_deployment_enabled` delegate so that
it is more in-line with the existing conventions.

**doc/api/groups.md:**
**doc/api/projects.md:**

Document support for `forward_deployment_enabled`.

**lib/api/entities/project.rb:**
**lib/api/helpers/projects_helpers.rb:**

Add API support for `forward_deployment_enabled`.

**spec/controllers/projects/settings/ci_cd_controller_spec.rb:**
**spec/features/projects/settings/pipelines_settings_spec.rb:**
**spec/requests/api/projects_spec.rb:**

Test support for `forward_deployment_enabled`.

**changelogs/unreleased/forward_deployment_enabled-api.yml:**

Changelog entry.