• Scan the output directory (default is ${project.basedir}/target/classes) and generating function.json for each function (method annotated with FunctionName) in the staging directory.
• Copy JAR files from the build directory (default is ${project.basedir}/target/) to the staging directory.

The default lifecycle phase for azure-functions:package is package. You can simply run mvn package to generate all the outputs you need to run/deploy your project.

Default staging directory is ${project.basedir}/target/azure-functions/${function-app-name}/