Fix circleci checkout (#7498)
Fix circleci checkout (#7498)

* Extend git clone with PR support, simplify checkout step

* Don't be quiet about git commands

* Re-add tag support

* Fix no-tag branch

diox/olympia,eviljeff/olympia,mozilla/addons-server,wagnerand/olympia,kumar303/addons-server,psiinon/addons-server,eviljeff/olympia,wagnerand/addons-server,wagnerand/olympia,atiqueahmedziad/addons-server,kumar303/addons-server,mozilla/addons-server,eviljeff/olympia,psiinon/addons-server,atiqueahmedziad/addons-server,mozilla/olympia,lavish205/olympia,wagnerand/addons-server,kumar303/olympia,lavish205/olympia,bqbn/addons-server,wagnerand/addons-server,kumar303/olympia,harry-7/addons-server,aviarypl/mozilla-l10n-addons-server,atiqueahmedziad/addons-server,wagnerand/addons-server,psiinon/addons-server,mozilla/addons-server,psiinon/addons-server,mozilla/olympia,kumar303/addons-server,diox/olympia,mozilla/addons-server,lavish205/olympia,harry-7/addons-server,bqbn/addons-server,mozilla/olympia,lavish205/olympia,diox/olympia,kumar303/olympia,atiqueahmedziad/addons-server,harry-7/addons-server,aviarypl/mozilla-l10n-addons-server,aviarypl/mozilla-l10n-addons-server,bqbn/addons-server,kumar303/addons-server,wagnerand/olympia,harry-7/addons-server,mozilla/olympia,aviarypl/mozilla-l10n-addons-server,wagnerand/olympia,kumar303/olympia,diox/olympia,eviljeff/olympia,bqbn/addons-server