nixos/ceph: create /etc/ceph and /var/lib/ceph via tmpfiles

We seem to be relying on those being present during runtime anyways.

nixos/modules/services/network-filesystems/ceph.nix

@@ -401,7 +401,9 @@ in
         mkMerge targets;
 
     systemd.tmpfiles.rules = [
+      "d /etc/ceph - ceph ceph - -"
       "d /run/ceph 0770 ceph ceph -"
+      "d /var/lib/ceph - ceph ceph - -"
     ];
   };
 }

nixos/tests/ceph-multi-node.nix

@@ -118,21 +118,12 @@ let
     $monA->mustSucceed(
       "mkdir -p /var/lib/ceph/mgr/ceph-${cfg.monA.name}",
       "mkdir -p /var/lib/ceph/mon/ceph-${cfg.monA.name}",
-      "chown ceph:ceph -R /var/lib/ceph/",
-      "mkdir -p /etc/ceph",
-      "chown ceph:ceph -R /etc/ceph"
     );
     $osd0->mustSucceed(
       "mkdir -p /var/lib/ceph/osd/ceph-${cfg.osd0.name}",
-      "chown ceph:ceph -R /var/lib/ceph/",
-      "mkdir -p /etc/ceph",
-      "chown ceph:ceph -R /etc/ceph"
     );
     $osd1->mustSucceed(
       "mkdir -p /var/lib/ceph/osd/ceph-${cfg.osd1.name}",
-      "chown ceph:ceph -R /var/lib/ceph/",
-      "mkdir -p /etc/ceph",
-      "chown ceph:ceph -R /etc/ceph"
     );
 
     # Bootstrap ceph-mon daemon

nixos/tests/ceph-single-node.nix

@@ -83,9 +83,6 @@ let
       "mkdir -p /var/lib/ceph/mon/ceph-${cfg.monA.name}",
       "mkdir -p /var/lib/ceph/osd/ceph-${cfg.osd0.name}",
       "mkdir -p /var/lib/ceph/osd/ceph-${cfg.osd1.name}",
-      "mkdir -p /etc/ceph",
-      "chown ceph:ceph -R /etc/ceph",
-      "chown ceph:ceph -R /var/lib/ceph/",
     );
 
     # Bootstrap ceph-mon daemon