- Variable reading/writing was reordered so that job logic
can override CEPH_REPO, SHA1, and chacra_url.
- For now, --rpm-no-match-sha avoids https://tracker.ceph.com/issues/72626
- Optionally archive sccache artifacts only if we used sccache. Avoids
the job hanging at the end (yes, I know allowEmptyArchive: true should
take care of it.. 2.jenkins didn't care.)
Signed-off-by: David Galloway <david.galloway@ibm.com>