Since Reef is EOL, the "reef" tag was removed from quay.ceph.io. The solution is to replace the reef references with the "v18.2.8" tag. I also added some yaml files to test the reef upgrade path, as those were missing. These exist in tentacle. Fixes: https://tracker.ceph.com/issues/76028 Signed-off-by: Laura Flores <lflores@ibm.com>