cluster: deploy NixOS-based ceph

First pass at a non-rook-managed Ceph cluster. We call it k0 instead of
ceph-waw4, as we pretty much are sure now that we will always have a
one-kube-cluster-to-one-ceph-cluster correspondence, with different Ceph
pools for different media kinds (if at all).

For now this has one mon and spinning rust OSDs. This can be iterated on
to make it less terrible with time.

See b/6 for more details.

Change-Id: Ie502a232c700af93f33fcad9fa1c57058161aa11
diff --git a/ops/ceph/COPYING b/ops/ceph/COPYING
new file mode 100644
index 0000000..fe46c6a
--- /dev/null
+++ b/ops/ceph/COPYING
@@ -0,0 +1,20 @@
+Copyright (c) 2003-2021 Eelco Dolstra and the Nixpkgs/NixOS contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.