add ci

.drone.yml

@@ -0,0 +1,13 @@
+---
+kind: pipeline
+name: default
+
+steps:
+  - name: thinkpad
+    image: nixos/nix:latest
+    commands:
+      - nix-channel --add https://nixos.org/channels/nixos-unstable nixos
+      - nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager
+      - nix-channel --update
+      - nix-build '<nixpkgs/nixos>' -j4 -A config.system.build.toplevel -I nixos-config=thinkpad/configuration.nix
+