add attic-sync-hydra service. refactor attic to its own module

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

systems/palatine-hill/attic/sync-attic.bash

@@ -0,0 +1,4 @@
+#!/usr/bin/env nix
+#! nix shell nixpkgs#bash nixpkgs#findutils nixpkgs#attic-client --command bash
+
+find . -regex ".*\.drv$" -exec attic push cache-nix-dot '/ZFS/ZFS-primary/hydra/{}' \;