Order commit comments in API chronologically

When fetching commit comments via API, the comments were not ordered,
but just returned in the order Postgresql finds them. Now the API always
returns comments in chronological order.

CHANGELOG

@@ -48,6 +48,7 @@ v 7.11.0 (unreleased)
   - Add footnotes support to Markdown (Guillaume Delbergue)
   - Add current_sign_in_at to UserFull REST api.
   - Make Sidekiq MemoryKiller shutdown signal configurable
+  - Order commit comments chronologically in API.
 
 v 7.10.2
   - Fix CI links on MR page

lib/api/commits.rb

@@ -62,7 +62,7 @@ module API
         sha = params[:sha]
         commit = user_project.commit(sha)
         not_found! 'Commit' unless commit
-        notes = Note.where(commit_id: commit.id)
+        notes = Note.where(commit_id: commit.id).order(:created_at)
         present paginate(notes), with: Entities::CommitNote
       end
 

spec/requests/api/commits_spec.rb

@@ -9,6 +9,7 @@ describe API::API, api: true  do
   let!(:master) { create(:project_member, user: user, project: project, access_level: ProjectMember::MASTER) }
   let!(:guest) { create(:project_member, user: user2, project: project, access_level: ProjectMember::GUEST) }
   let!(:note) { create(:note_on_commit, author: user, project: project, commit_id: project.repository.commit.id, note: 'a comment on a commit') }
+  let!(:another_note) { create(:note_on_commit, author: user, project: project, commit_id: project.repository.commit.id, note: 'another comment on a commit') }
 
   before { project.team << [user, :reporter] }
 
@@ -89,7 +90,7 @@ describe API::API, api: true  do
         get api("/projects/#{project.id}/repository/commits/#{project.repository.commit.id}/comments", user)
         expect(response.status).to eq(200)
         expect(json_response).to be_an Array
-        expect(json_response.length).to eq(1)
+        expect(json_response.length).to eq(2)
         expect(json_response.first['note']).to eq('a comment on a commit')
         expect(json_response.first['author']['id']).to eq(user.id)
       end