Github Actions Deploying Generated JAR file

I'm new to Github Actions and trying to figure out some basic processing. What I want to do is when I commit to my Java repo, Github Actions triggers a maven build which generates the Java JAR file. I then want to reference the JAR file in the next step of the workflow to deploy via SSH to a Cloud Server.

What I'm missing and can't find any current documentation to, is how I know the location of the generated JAR file when Github is generating it on its temporary VM. Below is the Github Actions script I currently have.

The very bottom portion with "source" is where I'm unsure what to provide.

Thank you.

steps:
- uses: actions/checkout@v1
- name: Set up JDK 1.8
  uses: actions/setup-java@v1
  with:
    java-version: 1.8
- name: Build with Maven
  run: mvn -B package --file pom.xml
- name: copy file via ssh key
  uses: appleboy/scp-action@master
  env:
    HOST: ${{ secrets.HOST }}
    USERNAME: ${{ secrets.USERNAME }}
    PORT: ${{ secrets.PORT }}
    KEY: ${{ secrets.KEY }}
  with:
    **source: "./bla.jar"**
    target: "/usr/test/"