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Add cost_factor params to Runner API

Aleksei Lipniagovrequested to merge
213822-add-cost-factors-to-runner-api into master

What does this MR do?

It adds cost factor params to Runners API, only available for gitlab.com.
It is intended to be used by Gitlab SREs to update the factors automatically if needed.
Currently, it could be done via UI only, which works while we have a relatively small amount of runners that need to be updated. Using rails-console is another option, but the API approach will be safer and more consistent.

⚠ I wasn't able to create specs for the .com case, as I have an issue with routes reloading.
I tried:

      context 'when runner is shared' do
        it 'updates runner' do
          ...
        end

        # THIS ONE WORKS 
        context 'when it is not gitlab.com' do
          it 'does not update cost factors' do
            update_runner(shared_runner.id,admin,
                          public_projects_minutes_cost_factor: 1.1,
                          private_projects_minutes_cost_factor: 2.2)

            shared_runner.reload

            expect(shared_runner.public_projects_minutes_cost_factor).to eq(0.0)
            expect(shared_runner.private_projects_minutes_cost_factor).to eq(1.0)
          end
        end
  
        # THIS ONE DOESN'T AS IT WON'T RELOAD THE CODE 
        context 'when on gitlab.com' do
          before do
            allow(Gitlab).to receive(:com?) { true }
            Rails.application.reload_routes!
          end

          after do
            allow(Gitlab).to receive(:com?) { false }
            Rails.application.reload_routes!
          end

          it 'updates cost factors' do
            update_runner(shared_runner.id,admin,
                          public_projects_minutes_cost_factor: 1.1,
                          private_projects_minutes_cost_factor: 2.2)

            shared_runner.reload

            expect(shared_runner.public_projects_minutes_cost_factor).to eq(1.1)
            expect(shared_runner.private_projects_minutes_cost_factor).to eq(2.2)
          end
        end
      end

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

For testing an updated API you could run something like this: curl --request PUT --header "PRIVATE-TOKEN: <YOUR_TOKEN>" --form "public_projects_minutes_cost_factor=7.7" http://localhost:3000/api/v4/runners/6

You should mock Gitlab#com? to return true on your instance.

Security

N/A

Related to #213822

Edited by 🤖 GitLab Bot 🤖

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