run git fetch origin REF before git checkout
#164
Merged
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In order to run checks against someone's forked PR, I'll need to be able to checkout the PR refs (
refs/pull/123/head).Along the way, remove the
:forlabel fromgit clone- just let it be cached, now that we have an explicitgit fetchfor the desired ref. It could make sense to allow a configurable label here in the future for e.g. weekly cache updating.Also update the CONTRIBUTING docs.