Add release badge

Author: will-molloy

README.md

@@ -1,6 +1,7 @@
 # java-template
 
 [![build](https://github.com/will-molloy/java-template/actions/workflows/build.yml/badge.svg?branch=main&event=push)](https://github.com/will-molloy/java-template/actions/workflows/build.yml)
+[![release](https://github.com/will-molloy/java-template/actions/workflows/release.yml/badge.svg?branch=main)](https://github.com/will-molloy/java-template/actions/workflows/release.yml)
 [![codecov](https://codecov.io/gh/will-molloy/java-template/branch/main/graph/badge.svg)](https://codecov.io/gh/will-molloy/java-template)
 
 template repo for Java projects using Gradle