Migrate to home-manager

overlays/default.nix

@@ -0,0 +1,21 @@
+{ inputs, ... }:
+{
+
+  additions = final: _prev: import ../pkgs final.pkgs;
+
+  modifications = final: prev: {
+
+    # https://discourse.nixos.org/t/disable-ssh-agent-from-gnome-keyring-on-gnome/28176/5
+    gnome-keyring = prev.gnome-keyring.overrideAttrs (oldAttrs: {
+      configureFlags = oldAttrs.configureFlags or [ ] ++ [ "--disable-ssh-agent" ];
+    });
+
+  };
+
+  unstable-packages = final: _prev: {
+    unstable = import inputs.nixpkgs-unstable {
+      system = final.system;
+      config.allowUnfree = true;
+    };
+  };
+}