Merge branch 'retry-cancelled-pipelines' into 'master'

Make cancelled pipelines being able to retry

## What does this MR do?

Make cancelled pipelines being able to retry

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug

## What are the relevant issue numbers?

Closes #23326

See merge request !6927

CHANGELOG.md

@@ -17,6 +17,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Fix centering of custom header logos (Ashley Dumaine)
   - ExpireBuildArtifactsWorker query builds table without ordering enqueuing one job per build to cleanup
   - Add an example for testing a phoenix application with Gitlab CI in the docs (Manthan Mallikarjun)
+  - Cancelled pipelines could be retried. !6927
   - Updating verbiage on git basics to be more intuitive
   - Clarify documentation for Runners API (Gennady Trafimenkov)
   - The instrumentation for Banzai::Renderer has been restored

app/models/ci/pipeline.rb

@@ -154,7 +154,7 @@ module Ci
 
     def retryable?
       builds.latest.any? do |build|
-        build.failed? && build.retryable?
+        (build.failed? || build.canceled?) && build.retryable?
       end
     end
 

spec/models/ci/pipeline_spec.rb

@@ -88,24 +88,38 @@ describe Ci::Pipeline, models: true do
 
     context 'no failed builds' do
       before do
-        FactoryGirl.create :ci_build, name: "rspec", pipeline: pipeline, status: 'success'
+        create_build('rspec', 'success')
       end
 
-      it 'be not retryable' do
+      it 'is not retryable' do
         is_expected.to be_falsey
       end
+
+      context 'one canceled job' do
+        before do
+          create_build('rubocop', 'canceled')
+        end
+
+        it 'is retryable' do
+          is_expected.to be_truthy
+        end
+      end
     end
 
     context 'with failed builds' do
       before do
-        FactoryGirl.create :ci_build, name: "rspec", pipeline: pipeline, status: 'running'
-        FactoryGirl.create :ci_build, name: "rubocop", pipeline: pipeline, status: 'failed'
+        create_build('rspec', 'running')
+        create_build('rubocop', 'failed')
       end
 
-      it 'be retryable' do
+      it 'is retryable' do
         is_expected.to be_truthy
       end
     end
+
+    def create_build(name, status)
+      create(:ci_build, name: name, status: status, pipeline: pipeline)
+    end
   end
 
   describe '#stages' do