Integrate core-services-01 in a nice workflow (#1)

This enables the tracking of core-services-01 over the infrastructure repository.

Co-authored-by: Gabriel DORIATH DOHLER <gabriel.doriath.dohler@ens.psl.eu>
Reviewed-on: https://git.rz.ens.wtf/Klub-RZ/infrastructure/pulls/1
Co-authored-by: raito <raito@noreply.git.rz.ens.wtf>
Co-committed-by: raito <raito@noreply.git.rz.ens.wtf>

machines/core-services-01/system.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+{
+  # Auto upgrades
+  system.autoUpgrade = {
+    enable = true;
+    allowReboot = false;
+  };
+
+  # Auto GC and store optimizations
+  nix = {
+    trustedUsers = [ "root" "gab" ];
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 90d";
+    };
+    optimise.automatic = true;
+    extraOptions = ''
+      min-free = ${toString (100 * 1024 * 1024)}
+      max-free = ${toString (1024 * 1024 * 1024)}
+    '';
+  };
+
+  services.locate = {
+    enable = true;
+    interval = "04:05";
+  };
+}