Move Maskable concern to Ci namespace

The concern is only used by CI variables

app/helpers/ci_variables_helper.rb

@@ -45,6 +45,6 @@ module CiVariablesHelper
   end
 
   def ci_variable_maskable_regex
-    Maskable::REGEX.inspect.sub('\\A', '^').sub('\\z', '$').sub(/^\//, '').sub(/\/[a-z]*$/, '').gsub('\/', '/')
+    Ci::Maskable::REGEX.inspect.sub('\\A', '^').sub('\\z', '$').sub(/^\//, '').sub(/\/[a-z]*$/, '').gsub('\/', '/')
   end
 end

app/models/ci/group_variable.rb

@@ -5,7 +5,7 @@ module Ci
     extend Gitlab::Ci::Model
     include HasVariable
     include Presentable
-    include Maskable
+    include Ci::Maskable
 
     belongs_to :group, class_name: "::Group"
 

app/models/ci/variable.rb

@@ -5,7 +5,7 @@ module Ci
     extend Gitlab::Ci::Model
     include HasVariable
     include Presentable
-    include Maskable
+    include Ci::Maskable
     prepend HasEnvironmentScope
 
     belongs_to :project

app/models/concerns/ci/maskable.rb

+# frozen_string_literal: true
+
+module Ci
+  module Maskable
+    extend ActiveSupport::Concern
+
+    # * Single line
+    # * No escape characters
+    # * No variables
+    # * No spaces
+    # * Minimal length of 8 characters
+    # * Characters must be from the Base64 alphabet (RFC4648) with the addition of @ and :
+    # * Absolutely no fun is allowed
+    REGEX = /\A[a-zA-Z0-9_+=\/@:-]{8,}\z/.freeze
+
+    included do
+      validates :masked, inclusion: { in: [true, false] }
+      validates :value, format: { with: REGEX }, if: :masked?
+    end
+
+    def to_runner_variable
+      super.merge(masked: masked?)
+    end
+  end
+end

app/models/concerns/maskable.rb

-# frozen_string_literal: true
-
-module Maskable
-  extend ActiveSupport::Concern
-
-  # * Single line
-  # * No escape characters
-  # * No variables
-  # * No spaces
-  # * Minimal length of 8 characters
-  # * Characters must be from the Base64 alphabet (RFC4648) with the addition of @ and :
-  # * Absolutely no fun is allowed
-  REGEX = /\A[a-zA-Z0-9_+=\/@:-]{8,}\z/.freeze
-
-  included do
-    validates :masked, inclusion: { in: [true, false] }
-    validates :value, format: { with: REGEX }, if: :masked?
-  end
-
-  def to_runner_variable
-    super.merge(masked: masked?)
-  end
-end

spec/models/ci/group_variable_spec.rb

@@ -8,7 +8,7 @@ describe Ci::GroupVariable do
   it_behaves_like "CI variable"
 
   it { is_expected.to include_module(Presentable) }
-  it { is_expected.to include_module(Maskable) }
+  it { is_expected.to include_module(Ci::Maskable) }
   it { is_expected.to validate_uniqueness_of(:key).scoped_to(:group_id).with_message(/\(\w+\) has already been taken/) }
 
   describe '.unprotected' do

spec/models/ci/variable_spec.rb

@@ -9,7 +9,7 @@ describe Ci::Variable do
 
   describe 'validations' do
     it { is_expected.to include_module(Presentable) }
-    it { is_expected.to include_module(Maskable) }
+    it { is_expected.to include_module(Ci::Maskable) }
     it { is_expected.to include_module(HasEnvironmentScope) }
     it { is_expected.to validate_uniqueness_of(:key).scoped_to(:project_id, :environment_scope).with_message(/\(\w+\) has already been taken/) }
   end

spec/models/concerns/maskable_spec.rb → spec/models/concerns/ci/maskable_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Maskable do
+describe Ci::Maskable do
   let(:variable) { build(:ci_variable) }
 
   describe 'masked value validations' do
@@ -34,7 +34,7 @@ describe Maskable do
   end
 
   describe 'REGEX' do
-    subject { Maskable::REGEX }
+    subject { Ci::Maskable::REGEX }
 
     it 'does not match strings shorter than 8 letters' do
       expect(subject.match?('hello')).to eq(false)