Add GitHub Actions workflow status badge in README.md

README.md

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 # [JOML](http://joml-ci.github.io/JOML) – Java OpenGL Math Library
 A Java math library for OpenGL rendering calculations | use it on: [Desktop](https://github.com/JOML-CI/JOML/wiki#maven-setup-for-desktop) / [Android](https://github.com/JOML-CI/JOML/wiki#gradle-setup-for-android) / [GWT](https://github.com/JOML-CI/JOML/wiki#gradle-setup-for-gwt)
 
-[![Maven Release](https://img.shields.io/maven-metadata/v/https/repo.maven.apache.org/maven2/org/joml/joml/maven-metadata.xml.svg)](https://search.maven.org/#search%7Cgav%7C1%7Cg%3Aorg.joml%20a%3Ajoml) [![Maven Snapshot](https://img.shields.io/nexus/s/https/oss.sonatype.org/org.joml/joml.svg)](https://oss.sonatype.org/content/repositories/snapshots/org/joml/joml/)
+![Build and Publish](https://github.com/JOML-CI/JOML/actions/workflows/main.yml/badge.svg) [![Maven Release](https://img.shields.io/maven-metadata/v/https/repo.maven.apache.org/maven2/org/joml/joml/maven-metadata.xml.svg)](https://search.maven.org/#search%7Cgav%7C1%7Cg%3Aorg.joml%20a%3Ajoml) [![Maven Snapshot](https://img.shields.io/nexus/s/https/oss.sonatype.org/org.joml/joml.svg)](https://oss.sonatype.org/content/repositories/snapshots/org/joml/joml/)
 
 Design goals
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