Merge branch 'api_only_allow_merge_if_build_succeeds' into 'master'

expose 'only_allow_merge_if_build_succeeds' project setting in the API

## What does this MR do?
Adds the 'only_allow_merge_if_build_succeeds' project setting in the API.

## Are there points in the code the reviewer needs to double check?
No, but maybe this code is not enough for ACLs or the like.

## Why was this MR needed?
Because that's a very useful setting to change via automation (through the API)

## What are the relevant issue numbers?

Closes #21085, closes https://gitlab.com/gitlab-org/gitlab-ce/issues/20088.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) 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
- [X] 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 you do - rebase it please)
- [X] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5930

1 files changed, 17 insertions, 7 deletions

diff --git a/doc/api/projects.md b/doc/api/projects.md
index 156deca932b..0e4806e31c5 100644
--- a/doc/api/projects.md
+++ b/doc/api/projects.md
@@ -84,7 +84,8 @@ Parameters:
     "star_count": 0,
     "runners_token": "b8547b1dc37721d05889db52fa2f02",
     "public_builds": true,
-    "shared_with_groups": []
+    "shared_with_groups": [],
+    "only_allow_merge_if_build_succeeds": false
   },
   {
     "id": 6,
@@ -144,7 +145,8 @@ Parameters:
     "star_count": 0,
     "runners_token": "b8547b1dc37721d05889db52fa2f02",
     "public_builds": true,
-    "shared_with_groups": []
+    "shared_with_groups": [],
+    "only_allow_merge_if_build_succeeds": false
   }
 ]
 ```
@@ -280,7 +282,8 @@ Parameters:
       "group_name": "Gitlab Org",
       "group_access_level": 10
     }
-  ]
+  ],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -448,6 +451,7 @@ Parameters:
 - `visibility_level` (optional)
 - `import_url` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 ### Create project for user
 
@@ -473,6 +477,7 @@ Parameters:
 - `visibility_level` (optional)
 - `import_url` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 ### Edit project
 
@@ -499,6 +504,7 @@ Parameters:
 - `public` (optional) - if `true` same as setting visibility_level = 20
 - `visibility_level` (optional)
 - `public_builds` (optional)
+- `only_allow_merge_if_build_succeeds` (optional)
 
 On success, method returns 200 with the updated project. If parameters are
 invalid, 400 is returned.
@@ -577,7 +583,8 @@ Example response:
   "forks_count": 0,
   "star_count": 1,
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -643,7 +650,8 @@ Example response:
   "forks_count": 0,
   "star_count": 0,
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -729,7 +737,8 @@ Example response:
   "star_count": 0,
   "runners_token": "b8bc4a7a29eb76ea83cf79e4908c2b",
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```
 
@@ -815,7 +824,8 @@ Example response:
   "star_count": 0,
   "runners_token": "b8bc4a7a29eb76ea83cf79e4908c2b",
   "public_builds": true,
-  "shared_with_groups": []
+  "shared_with_groups": [],
+  "only_allow_merge_if_build_succeeds": false
 }
 ```