qa/cephadm: specify using container host distros for workunits

Right now, the OS Type and OS Version for these workunits
tests is left blank on pulpito and they appear to be trying to
run ubuntu jammy currently which is causing failures. We should
specify what distros the tests should run on then very explicitly
tell it to start trying new distros when we can get the tests to
pass.

Signed-off-by: Adam King <adking@redhat.com>

diff --git a/qa/suites/orch/cephadm/workunits/0-distro b/qa/suites/orch/cephadm/workunits/0-distro
new file mode 120000 (symlink)
index 0000000..4b34171
--- /dev/null
+++ b/qa/suites/orch/cephadm/workunits/0-distro
@@ -0,0 +1 @@
+.qa/distros/container-hosts
\ No newline at end of file