Add github ci

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: install mkdocs
+      run: pip3 install mkdocs==1.6.1
+
+    - name: build
+      run: make

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/rfjakob/gocryptfs-website.svg?branch=master)](https://travis-ci.org/rfjakob/gocryptfs-website)
+![ci](https://github.com/rfjakob/gocryptfs-website/actions/workflows/ci.yml/badge.svg)
 
 This repostitory contains the gocryptfs website that is available at
 https://nuetzlich.net/gocryptfs .