automatically upload the nix store to the cache

config/default.nix

@@ -8,6 +8,7 @@
     ./services/loki.nix
     ./home.nix
     ./services/restic.nix
+    ./services/nix-cache-upload.nix
   ];
   services.openssh.enable = true;
   environment.systemPackages = [ pkgs.git ];

config/services/nix-cache-upload.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+let
+in
+{
+  systemd.services.copy-to-cache = {
+    enable = true;
+    description = "Copy nix cache to cache.int.chir.rs";
+    script = ''
+      #!${pkgs.bash}/bin/bash
+      ${pkgs.nix}/bin/nix copy --to 's3://cache.int.chir.rs?scheme=https&endpoint=minio.int.chir.rs' --all
+    '';
+    unitConfig = {
+      user = "darkkirb";
+      group = "users";
+    };
+  };
+  systemd.timers.copy-to-cache = {
+    enable = true;
+    description = "Copy nix cache to cache.int.chir.rs";
+    requires = [ "copy-to-cache.service" ];
+    wantedBy = [ "multi-user.target" ];
+    timerConfig = {
+      onUnitActiveSec = 3600;
+      onBootSec = 3600;
+    };
+  };
+}