fix(deploy): set up (magic) auto rollbacks on 'hecuba' using 'deploy-rs'

deploy/colmena.nix

@@ -6,7 +6,14 @@
 let
   inherit (inputs.nixpkgs) lib;
   utils = import ../utils { inherit lib; };
-  hostnames = utils.dirNames ../hosts;
+  # exclude hosts that need auto rollback (until `colmena` supports it) for
+  # now, we use `deploy-rs` (which has magic rollback) for those (also see ./deploy-rs.nix)
+  #
+  # see <https://github.com/nix-community/colmena/issues/38>
+  #     <https://github.com/nix-community/colmena/issues/344>
+  hostnames = lib.filter (
+    hostname: !((utils.hostMeta ../hosts/${hostname}).deploy.autoRollback or false)
+  ) (utils.dirNames ../hosts);
 
   mkNode =
     hostname: