maven-resources-plugin

• https://maven.apache.org/plugins/
• https://maven.apache.org/plugins/maven-resources-plugin/
• https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging

<plugin>
  <artifactId>maven-resources-plugin</artifactId>
  <version>3.3.1</version>
</plugin>

• Copy the resources to the output directory for including in the JAR.
• Main resources & Test resources