Revert "Merge branch 'tests-use-tmpfs' into 'master'"

This reverts merge request !6730

.gitlab-ci.yml

@@ -19,8 +19,6 @@ variables:
 before_script:
   - source ./scripts/prepare_build.sh
   - cp config/gitlab.yml.example config/gitlab.yml
-  - mkdir -p tmp/tests
-  - mount -t tmpfs tmpfs tmp/tests || echo "tmpfs mount failed, falling back to disc"
   - bundle --version
   - '[ "$USE_BUNDLE_INSTALL" != "true" ] || retry bundle install --without postgres production --jobs $(nproc) "${FLAGS[@]}"'
   - retry gem install knapsack

spec/spec_helper.rb

@@ -50,11 +50,6 @@ RSpec.configure do |config|
     example.run
     Rails.cache = caching_store
   end
-
-  config.after(:each) do
-    FileUtils.rm_rf("tmp/tests/repositories")
-    FileUtils.mkdir_p("tmp/tests/repositories")
-  end
 end
 
 FactoryGirl::SyntaxRunner.class_eval do