The setup-gradle action should make it easy to run with wrapper in an OS-agnostic way

[bigdaz]

Now that the arguments parameter has been removed, it's inconvenient to write a matrix Job that tests against Windows and Ubuntu. This is because the execution step needs to differentiate between ./gradlew on Ubuntu and gradlew.bat on Windows.

To fix this, we should:

• Fix Specifying gradle-version: 'wrapper' does not cause Gradle wrapper to be used #273 so that setting the version to wrapper allows the gradle command to execute a local wrapper if available.
• Make gradle-version: wrapper the default.

We could also make gradle-version: wrapper to fail if no wrapper is present, and have gradle-version: wrapper-or-path as the default.

[cloudshiftchris]

Is there a need to even consider gradlew.bat?

This works fine on Windows runners to execute the wrapper:

      - name: Execute Gradle
        shell: bash
        run: |
          ./gradlew build

[bigdaz]

@cloudshiftchris You're absolutely correct. Even without the explicit shell configuration, the default shell on Windows (pwsh) runs ./gradlew just fine.

This issue was reported to me and I didn't test it until now :).