Merge branch 'fix/builds-api-builds-for-commit-search' into 'master'

Find all builds for commit if there are multiple pipelines for it

## What does this MR do?

This MR fixes a builds API. When multiple pipelines were triggered for a commit, then API returned builds only from the last pipeline.

## What are the relevant issue numbers?

Closes #18912  
Closes #19243 

## 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 !4849

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/api/builds.rb b/lib/api/builds.rb
index 979328efe0e..086d8511e8f 100644
--- a/lib/api/builds.rb
+++ b/lib/api/builds.rb
@@ -33,10 +33,10 @@ module API
       get ':id/repository/commits/:sha/builds' do
         authorize_read_builds!
 
-        commit = user_project.pipelines.find_by_sha(params[:sha])
-        return not_found! unless commit
+        return not_found! unless user_project.commit(params[:sha])
 
-        builds = commit.builds.order('id DESC')
+        pipelines = user_project.pipelines.where(sha: params[:sha])
+        builds = user_project.builds.where(pipeline: pipelines).order('id DESC')
         builds = filter_builds(builds, params[:scope])
 
         present paginate(builds), with: Entities::Build,