Make the piper binary location an input parameter

[blackhatcrazy]

Currently the piper binary is downloaded to the fixed location ${process.cwd()}/${version}/${piperBinaryName} as seen here.

This causes problems when using this action in combination with act to run a piper-step locally.

Please allow for an alternative path configuration input for the action.

[milkotodorov]

I've made a PR for the same purpose: #204
This way it should work locally.
Waiting to be merged.

[milkotodorov]

You can use as follows in your github actions yaml to do a local compilation of piper:

with:
  piper-version: 'devel:SAP:jenkins-library:<version_or_commit_hash>'

That works as workaround too.