feat(docker): arion -> khepri

modules/docker/default.nix

@@ -0,0 +1,41 @@
+{
+  config,
+  khepri,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkOption types;
+
+  inherit (config.vars) mainUser;
+in {
+  imports = [khepri.nixosModules.default];
+
+  options.khepri = {
+    rwDataDir = mkOption {
+      default = "/var/lib/docker";
+      type = types.str;
+      description = ''
+        Directory to place persistent data in.
+      '';
+    };
+  };
+
+  config = {
+    users.extraUsers.${mainUser}.extraGroups = ["docker"];
+
+    virtualisation = {
+      docker = {
+        enable = true;
+        storageDriver = "btrfs";
+      };
+      # khepri uses oci-containers under the hood and it must be set to docker to work
+      oci-containers.backend = "docker";
+    };
+
+    # Script for updating the images of all images of a compose.nix file
+    environment.systemPackages = with pkgs; [
+      (callPackage ./updateImage.nix {})
+    ];
+  };
+}