Merge branch 'fix-some-specs' into 'master'

Improve appearance_spec and deploy_key_spec

In appearance_spec.rb we can use build instead create record in db. In deploy_key_spec.rb we can remove unused code.

See merge request !6819

spec/models/appearance_spec.rb

 require 'rails_helper'
 
 RSpec.describe Appearance, type: :model do
-  subject { create(:appearance) }
+  subject { build(:appearance) }
 
   it { is_expected.to be_valid }
 

spec/models/deploy_key_spec.rb

 require 'spec_helper'
 
 describe DeployKey, models: true do
-  let(:project) { create(:project) }
-  let(:deploy_key) { create(:deploy_key, projects: [project]) }
-
   describe "Associations" do
     it { is_expected.to have_many(:deploy_keys_projects) }
     it { is_expected.to have_many(:projects) }