findfiles doesnt seem to work with linux relative paths

[issc29]

When trying to use appservice-actions Webapp deployer, I tried using the package syntax with a relative path (or variable) and glob (example: ./target/*.jar or ${GITHUB_WORKSPACE/target/*.jar}) and it was not able to pick up the package that I wanted.

    - uses: azure/appservice-actions/webapp@master
      with: 
        app-name: example
        publish-profile: ${{ secrets.azureWebAppPublishProfile }}
        package:  ./target/example*.jar 

When I set it to a direct path with glob it worked.

    - uses: azure/appservice-actions/webapp@master
      with: 
        app-name: example
        publish-profile: ${{ secrets.azureWebAppPublishProfile }}
        package:  /home/runner/work/example/example/target/example*.jar 

I was able to trace it back to this package and I believe there is something wrong in the utility not respecting linux relative paths or environment variables in the path.