Verify JWT messages from gitlab-workhorse

.gitignore

app/controllers/projects/git_http_client_controller.rb

app/controllers/projects/git_http_controller.rb

app/controllers/projects/lfs_storage_controller.rb

app/helpers/workhorse_helper.rb

config/initializers/gitlab_workhorse_secret.rb

lib/ci/api/builds.rb

lib/gitlab/workhorse.rb

spec/lib/gitlab/workhorse_spec.rb

spec/requests/ci/api/builds_spec.rb

spec/requests/git_http_spec.rb

spec/requests/lfs_http_spec.rb

spec/support/workhorse_helpers.rb