Replace Travis CI with GitHub Actions (#211)

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: build
+on: [push, pull_request]
+
+env:
+  global:
+    NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Ruby
+      uses: ruby/setup-ruby@master
+      with:
+        ruby-version: 2.6.3
+    - name: Install dependencies
+      run: |
+       sudo apt-get install libcurl4-openssl-dev
+       bundle install --jobs=3 --retry=3 --deployment
+    - name: Run tests
+      run: |
+       bundle exec jekyll build
+       bundle exec htmlproofer '_site/' --allow-hash-href --check-html --http-status-ignore 0

.travis.yml

@@ -1,17 +0,0 @@
-language: ruby
-
-rvm:
-  - 2.6.3
-
-env:
-  global:
-    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer
-
-addons:
-  apt:
-    packages:
-    - libcurl4-openssl-dev # required to avoid SSL errors
-
-script:
-  - bundle exec jekyll build
-  - bundle exec htmlproofer '_site/' --allow-hash-href --check-html --http-status-ignore 0

README.md

@@ -1,5 +1,6 @@
 # www.minetest.net
 
+[![Build status](https://github.com/minetest/minetest.github.io/workflows/build/badge.svg)](https://github.com/minetest/minetest.github.io/actions)\
 The official Minetest website, living at [www.minetest.net](https://www.minetest.net).
 
 ## Features