Read a value from a Java/JVM Properties file

Simple action to read a value from a Java Properties file. The available options seem to use a container vs just JS, which didn't work well in the situations we needed it.

This action is very simple. We're currently using it to read version info from gradle.properties. Here is the yaml code:

- uses: touchlab/read-property@main
  id: versionprop
  with:
    file: ./gradle.properties
    property: LIBRARY_VERSION

Accessing the value is also simple:

- name: Print Output
  id: output
  run: echo "${{ steps.versionprop.outputs.propVal }}"

The outcome in cases of an error is currently undefined. We needed a quick and simple solution to the problem at hand. If there's demand, we'll define the edge cases better in the future. Please reach out.