Enable even more frozen string in lib/gitlab

Enables frozens string for the following:

* lib/gitlab/conflict/**/*.rb
* lib/gitlab/cross_project_access/**/*.rb
* lib/gitlab/cycle_analytics/**/*.rb
* lib/gitlab/data_builder/**/*.rb
* lib/gitlab/database/**/*.rb
* lib/gitlab/dependency_linker/**/*.rb
* lib/gitlab/diff/**/*.rb
* lib/gitlab/downtime_check/**/*.rb
* lib/gitlab/email/**/*.rb
* lib/gitlab/etag_caching/**/*.rb

Partially addresses gitlab-org/gitlab-ce#47424.

14 files changed, 28 insertions, 0 deletions

diff --git a/lib/gitlab/dependency_linker/base_linker.rb b/lib/gitlab/dependency_linker/base_linker.rb
index d2360583741..ac2efe598b4 100644
--- a/lib/gitlab/dependency_linker/base_linker.rb
+++ b/lib/gitlab/dependency_linker/base_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class BaseLinker
diff --git a/lib/gitlab/dependency_linker/cartfile_linker.rb b/lib/gitlab/dependency_linker/cartfile_linker.rb
index 4f69f2c4ab2..0e33f0956dd 100644
--- a/lib/gitlab/dependency_linker/cartfile_linker.rb
+++ b/lib/gitlab/dependency_linker/cartfile_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class CartfileLinker < MethodLinker
diff --git a/lib/gitlab/dependency_linker/cocoapods.rb b/lib/gitlab/dependency_linker/cocoapods.rb
index 2fbde7da1b4..38eabe303de 100644
--- a/lib/gitlab/dependency_linker/cocoapods.rb
+++ b/lib/gitlab/dependency_linker/cocoapods.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     module Cocoapods
diff --git a/lib/gitlab/dependency_linker/composer_json_linker.rb b/lib/gitlab/dependency_linker/composer_json_linker.rb
index cfd4ec15125..22d2bead891 100644
--- a/lib/gitlab/dependency_linker/composer_json_linker.rb
+++ b/lib/gitlab/dependency_linker/composer_json_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class ComposerJsonLinker < PackageJsonLinker
diff --git a/lib/gitlab/dependency_linker/gemfile_linker.rb b/lib/gitlab/dependency_linker/gemfile_linker.rb
index bfea836bcb2..8ab219c4962 100644
--- a/lib/gitlab/dependency_linker/gemfile_linker.rb
+++ b/lib/gitlab/dependency_linker/gemfile_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class GemfileLinker < MethodLinker
diff --git a/lib/gitlab/dependency_linker/gemspec_linker.rb b/lib/gitlab/dependency_linker/gemspec_linker.rb
index f1783ee2ab4..b924ea86d89 100644
--- a/lib/gitlab/dependency_linker/gemspec_linker.rb
+++ b/lib/gitlab/dependency_linker/gemspec_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class GemspecLinker < MethodLinker
diff --git a/lib/gitlab/dependency_linker/godeps_json_linker.rb b/lib/gitlab/dependency_linker/godeps_json_linker.rb
index fe091baee6d..d24c137793e 100644
--- a/lib/gitlab/dependency_linker/godeps_json_linker.rb
+++ b/lib/gitlab/dependency_linker/godeps_json_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class GodepsJsonLinker < JsonLinker
diff --git a/lib/gitlab/dependency_linker/json_linker.rb b/lib/gitlab/dependency_linker/json_linker.rb
index a8ef25233d8..298d214df61 100644
--- a/lib/gitlab/dependency_linker/json_linker.rb
+++ b/lib/gitlab/dependency_linker/json_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class JsonLinker < BaseLinker
diff --git a/lib/gitlab/dependency_linker/method_linker.rb b/lib/gitlab/dependency_linker/method_linker.rb
index 0ffa2a83c93..d4d85bb3390 100644
--- a/lib/gitlab/dependency_linker/method_linker.rb
+++ b/lib/gitlab/dependency_linker/method_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class MethodLinker < BaseLinker
diff --git a/lib/gitlab/dependency_linker/package_json_linker.rb b/lib/gitlab/dependency_linker/package_json_linker.rb
index 330c95f0880..578e25f806a 100644
--- a/lib/gitlab/dependency_linker/package_json_linker.rb
+++ b/lib/gitlab/dependency_linker/package_json_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class PackageJsonLinker < JsonLinker
diff --git a/lib/gitlab/dependency_linker/podfile_linker.rb b/lib/gitlab/dependency_linker/podfile_linker.rb
index 60ad166ea17..def9b04cca9 100644
--- a/lib/gitlab/dependency_linker/podfile_linker.rb
+++ b/lib/gitlab/dependency_linker/podfile_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class PodfileLinker < GemfileLinker
diff --git a/lib/gitlab/dependency_linker/podspec_json_linker.rb b/lib/gitlab/dependency_linker/podspec_json_linker.rb
index d82237ed3f1..1a2493e7cc0 100644
--- a/lib/gitlab/dependency_linker/podspec_json_linker.rb
+++ b/lib/gitlab/dependency_linker/podspec_json_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class PodspecJsonLinker < JsonLinker
diff --git a/lib/gitlab/dependency_linker/podspec_linker.rb b/lib/gitlab/dependency_linker/podspec_linker.rb
index 924e55e9820..6b1758c5a43 100644
--- a/lib/gitlab/dependency_linker/podspec_linker.rb
+++ b/lib/gitlab/dependency_linker/podspec_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class PodspecLinker < MethodLinker
diff --git a/lib/gitlab/dependency_linker/requirements_txt_linker.rb b/lib/gitlab/dependency_linker/requirements_txt_linker.rb
index 9c9620bc36a..f630c13b760 100644
--- a/lib/gitlab/dependency_linker/requirements_txt_linker.rb
+++ b/lib/gitlab/dependency_linker/requirements_txt_linker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Gitlab
   module DependencyLinker
     class RequirementsTxtLinker < BaseLinker