README: add github actions documentation

README.md

@@ -10,11 +10,11 @@
    * Remember to mark the broken packages as `broken = true;` in the `meta`
      attribute, or travis (and consequently caching) will fail!
    * Library functions, modules and overlays go in the respective directories
-3. Add your NUR repo name and your cachix repo name (optional) to
-   [.travis.yml](./.travis.yml)
-4. Enable travis for your repo
-   * You can add a cron job in the repository settings on travis to keep your
-     cachix cache fresh
+3. Choose your CI: Depending on your preference you can use github actions (recommended) or [Travis ci](https://travis-ci.com).
+   - Github actions: Change your NUR repo name and optionally add a cachix name in [.github/workflows/build.yml](./.github/workflows/build.yml) and change the cron timer
+     to a random value as described in the file
+   - Travis ci: Change your NUR repo name and optionally your cachix repo name in 
+   [.travis.yml](./.travis.yml). Than enable travis in your repo. You can add a cron job in the repository settings on travis to keep your cachix cache fresh
 5. Change your travis and cachix names on the README template section and delete
    the rest
 6. [Add yourself to NUR](https://github.com/nix-community/NUR#how-to-add-your-own-repository)
@@ -25,7 +25,14 @@
 
 **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/nix-community/<YOU-GITHUB-USER>/workflows/Build%20and%20populate%20cache/badge.svg)
+
+<!--
+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)