ci: zip artifact into eponymous directory.

ci: Fix condition to skip publish

Signed-off-by: Jason Volk <jason@zemos.net>

.github/workflows/publish.yml

@@ -48,7 +48,7 @@ jobs:
       ${{
         !failure() && !cancelled()
         && inputs.machines
-        && inputs.docker_repo
+        && inputs.docker_repo != ''
         && github.ref == 'refs/heads/main'
       }}
     name: Publish containers