cluster/services/storage: allow configuring garage buckets and keys through cluster options

cluster/services/storage/default.nix

@@ -5,6 +5,10 @@ let
 in
 
 {
+  imports = [
+    ./options.nix
+  ];
+
   services.storage = {
     nodes = {
       external = [ "prophet" ];
@@ -20,6 +24,11 @@ in
         ./garage.nix
         ./garage-options.nix
         ./garage-layout.nix
+        {
+          services.garage = {
+            inherit (config.garage) buckets keys;
+          };
+        }
       ];
       garageInternal = [ ./garage-internal.nix ];
       garageExternal = [ ./garage-external.nix ];

cluster/services/storage/options.nix

@@ -0,0 +1,17 @@
+{ lib, ... }:
+
+{
+  options.garage = {
+    buckets = lib.mkOption {
+      description = "Buckets to create in Garage.";
+      type = with lib.types; attrsOf anything;
+      default = {};
+    };
+
+    keys = lib.mkOption {
+      description = "Keys to create in Garage.";
+      type = with lib.types; attrsOf anything;
+      default = {};
+    };
+  };
+}