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
First, you need to generate the package using Maven:
mvn clean package
Then, copy the generated war file in the target directory to the docker folder, build the docker image using the included Dockerfile and run it. You should be able to reach the endpoint via http://localhost:8080/hola.
The complete instructions are here.