task: Clean up previous dir before executing
task: Clean up previous dir before executing

This is mainly useful for local builds.

cgwalters/rpm-ostree-cgwalters,tmp-user/rpm-ostree,giuseppe/rpm-ostree,mdshuai/rpm-ostree,projectatomic/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,mdshuai/rpm-ostree,maxamillion/rpm-ostree-toolbox,cgwalters/rpm-ostree-cgwalters,maxamillion/rpm-ostree-toolbox,mdshuai/rpm-ostree,sujitfulse/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,tmp-user/rpm-ostree,tlitovsk/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,giuseppe/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,mdshuai/rpm-ostree,maxamillion/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,giuseppe/rpm-ostree,sujitfulse/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,projectatomic/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,tmp-user/rpm-ostree,maxamillion/rpm-ostree-toolbox,sujitfulse/rpm-ostree-toolbox,giuseppe/rpm-ostree,tlitovsk/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,cgwalters/rpm-ostree-cgwalters,giuseppe/rpm-ostree-toolbox,markllama/rpm-ostree-toolbox,maxamillion/rpm-ostree-toolbox,giuseppe/rpm-ostree,markllama/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,tlitovsk/rpm-ostree-toolbox,tmp-user/rpm-ostree