test: Force checkout in github-task
test: Force checkout in github-task

Without this there are combinations of commits that cause all
the verify machines to eventually fail with:

error: The following untracked working tree files would be overwritten by checkout:

Closes #4370
Reviewed-by: Peter <a316049dd34607c62d4611d63ab22a6454add223@redhat.com>

garrett/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,Scribery/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,arilivigni/cockpit,SotolitoLabs/cockpit,petervo/cockpit,martinpitt/cockpit,larsu/cockpit,arilivigni/cockpit,larsu/cockpit,vanloswang/cockpit,vanloswang/cockpit,deryni/cockpit,deryni/cockpit,sgallagher/cockpit,xhad/cockpit,moraleslazaro/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,arilivigni/cockpit,arilivigni/cockpit,mareklibra/cockpit,Scribery/cockpit,dperpeet/cockpit,stefwalter/cockpit,dperpeet/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,mvollmer/cockpit,andreasn/cockpit,harishanand95/cockpit,martinpitt/cockpit,larskarlitski/cockpit,dperpeet/cockpit,xhad/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,michalskrivanek/cockpit,xhad/cockpit,SotolitoLabs/cockpit,xhad/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,arilivigni/cockpit,deryni/cockpit,stefwalter/cockpit,stefwalter/cockpit,harishanand95/cockpit,Scribery/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,andreasn/cockpit,vanloswang/cockpit,dperpeet/cockpit,xhad/cockpit,moraleslazaro/cockpit,sgallagher/cockpit,sgallagher/cockpit,petervo/cockpit,michalskrivanek/cockpit,andreasn/cockpit,cockpit-project/cockpit,vanloswang/cockpit,arilivigni/cockpit,mareklibra/cockpit,dperpeet/cockpit,mvollmer/cockpit,xhad/cockpit,garrett/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,petervo/cockpit,larskarlitski/cockpit,arilivigni/cockpit,larskarlitski/cockpit,mvollmer/cockpit,stefwalter/cockpit,xhad/cockpit,Scribery/cockpit,deryni/cockpit,larskarlitski/cockpit,harishanand95/cockpit,harishanand95/cockpit,andreasn/cockpit,harishanand95/cockpit,vanloswang/cockpit,larskarlitski/cockpit,mvollmer/cockpit,petervo/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,larsu/cockpit,cockpituous/cockpit,harishanand95/cockpit,stefwalter/cockpit,martinpitt/cockpit,petervo/cockpit,mareklibra/cockpit,larsu/cockpit,Scribery/cockpit,mareklibra/cockpit,cockpit-project/cockpit,deryni/cockpit,andreasn/cockpit,mareklibra/cockpit,garrett/cockpit,cockpituous/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,Scribery/cockpit,stefwalter/cockpit,Scribery/cockpit,sgallagher/cockpit,larsu/cockpit,andreasn/cockpit,petervo/cockpit,sgallagher/cockpit,vanloswang/cockpit,garrett/cockpit,cockpit-project/cockpit,sgallagher/cockpit,sgallagher/cockpit,larsu/cockpit,michalskrivanek/cockpit,petervo/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpituous/cockpit,michalskrivanek/cockpit,vanloswang/cockpit,stefwalter/cockpit