This is a sample project that shows how to deploy a war file with a Spring Boot 2 application on a Wildfly server, included in a post at The Practical Developer site
You need to have a JDK 11 installed in your system. Then, run the script docker-build.sh (or the commands inside if you're in Windows) and you will generate an image with a sample Spring Boot application packaged in a war file and deployed to Wildfly and Tomcat.
The complete instructions are here.