boreal: get rid of git crypt secrets for this host

Also move to restic-backup

hosts/boreal/default.nix

@@ -3,9 +3,6 @@
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
 { config, lib, pkgs, ... }:
-let
-  secrets = config.my.secrets;
-in
 {
   imports =
     [ # Include the results of the hardware scan.
@@ -46,17 +43,12 @@ in
 
   # List services that you want to enable:
   my.services = {
-    borg-backup = {
+    restic-backup = {
       enable = true;
-      repo = secrets.borg-backup.boreal-repo;
-      # for a workstation, having backups spanning the last month should be
-      # enough
-      prune = {
-        keep = {
-          daily = 7;
-          weekly = 4;
-        };
-      };
+      repo = "b2:boreal-backup";
+      passwordFile = config.age.secrets."restic-backup/boreal-password".path;
+      environmentFile = config.age.secrets."restic-backup/boreal-credentials".path;
+
       paths = [
         "/home/alarsyo"
       ];