bots: Add workaround for failing rpm-ostree upgrade check
bots: Add workaround for failing rpm-ostree upgrade check

Checking for updates with a local repository fails with

    Initiated txn DownloadUpdateRpmDiff for caller :1.36: /org/projectatomic/rpmostree1/fedora_atomic
    libostree pull from 'local' for fedora/28/x86_64/atomic-host complete
    Txn DownloadUpdateRpmDiff on /org/projectatomic/rpmostree1/fedora_atomic failed: open(O_TMPFILE): No such file or directory

Pre-create the missing /var/cache/rpm-ostree/ directory for the time
being, until this is fixed.

stefwalter/cockpit,SotolitoLabs/cockpit,deryni/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,stefwalter/cockpit,martinpitt/cockpit,mvollmer/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mareklibra/cockpit,mareklibra/cockpit,martinpitt/cockpit,mareklibra/cockpit,mvollmer/cockpit,cockpituous/cockpit,garrett/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,cockpituous/cockpit,stefwalter/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,stefwalter/cockpit,garrett/cockpit,andreasn/cockpit,mareklibra/cockpit,cockpit-project/cockpit,stefwalter/cockpit,deryni/cockpit,cockpit-project/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,andreasn/cockpit,andreasn/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,deryni/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,garrett/cockpit,cockpituous/cockpit,garrett/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,andreasn/cockpit,deryni/cockpit,mvollmer/cockpit,deryni/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,cockpit-project/cockpit,SotolitoLabs/cockpit