tests: disable reef/el9/aarch64

once arm64 rpms are available at download.ceph.com for reef el9 we can
revert this commit

Signed-off-by: Guillaume Abrioux <gabrioux@ibm.com>

.github/workflows/container.yml

@@ -48,6 +48,8 @@ jobs:
             ceph_release: squid
           - os: 9
             ceph_release: quincy
+          - os: 9
+            ceph_release: reef
     runs-on: ubuntu-latest
     steps:
       - name: checkout