Add Drone CI config

.drone.yml

@@ -0,0 +1,12 @@
+---
+kind: pipeline
+name: default
+
+steps:
+- name: build
+  image: nixos/nix
+  commands:
+  - nix-build ci.nix -A buildOutputs
+  - nix eval -f default.nix 'lib'
+  - nix eval -f default.nix 'modules'
+  - nix eval -f default.nix 'overlays'

README.md

@@ -2,13 +2,7 @@
 
 **My personal [NUR](https://github.com/nix-community/NUR) repository**
 
-<!-- Remove this if you don't use github actions -->
-![Build and populate cache](https://github.com/<YOUR-GITHUB-USER>/nur-packages/workflows/Build%20and%20populate%20cache/badge.svg)
+![Drone (self-hosted)](https://img.shields.io/drone/build/petrichor/nixexprs?server=https%3A%2F%2Fdrone.tildegit.org)
 
-<!--
-Uncomment this if you use travis:
-
-[![Build Status](https://travis-ci.com/<YOUR_TRAVIS_USERNAME>/nur-packages.svg?branch=master)](https://travis-ci.com/<YOUR_TRAVIS_USERNAME>/nur-packages)
--->
 [![Cachix Cache](https://img.shields.io/badge/cachix-<YOUR_CACHIX_CACHE_NAME>-blue.svg)](https://<YOUR_CACHIX_CACHE_NAME>.cachix.org)