Remove unused method from CI/CD build class

app/models/ci/build.rb

@@ -55,15 +55,6 @@ module Ci
         pending.unstarted.order('created_at ASC').first
       end
 
-      def create_from(build)
-        new_build = build.dup
-        new_build.status = 'pending'
-        new_build.runner_id = nil
-        new_build.trigger_request_id = nil
-        new_build.token = nil
-        new_build.save
-      end
-
       def retry(build, current_user)
         Ci::RetryBuildService
           .new(build.project, current_user)

spec/models/ci/build_spec.rb

@@ -181,20 +181,6 @@ describe Ci::Build, :models do
     end
   end
 
-  describe '#create_from' do
-    before do
-      build.status = 'success'
-      build.save
-    end
-    let(:create_from_build) { Ci::Build.create_from build }
-
-    it 'exists a pending task' do
-      expect(Ci::Build.pending.count(:all)).to eq 0
-      create_from_build
-      expect(Ci::Build.pending.count(:all)).to be > 0
-    end
-  end
-
   describe '#depends_on_builds' do
     let!(:build) { create(:ci_build, pipeline: pipeline, name: 'build', stage_idx: 0, stage: 'build') }
     let!(:rspec_test) { create(:ci_build, pipeline: pipeline, name: 'rspec', stage_idx: 1, stage: 'test') }