Add GitHub build status

Author: jericson

about.md

@@ -39,6 +39,8 @@ the games I've been playing recently:
 The source of this site can be found on
 [GitHub](https://github.com/jericson/jericson.github.io).
 
+![GitHub Actions status](https://github.com/jericson/jericson.github.io/actions/workflows/jekyll.yml/badge.svg)
+
 <!--[![Build
 Status](https://travis-ci.org/jericson/jericson.github.io.svg?branch=master)](https://travis-ci.org/jericson/jericson.github.io) -->
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