path '.' duplicate last dir

[gcb]

using project_path: . when gradlew is on the repo root will fail the build with

Couldn't find gradlew at path '/home/runner/work/repo_name/repo_name/gradlew'

# minimum reproducible case using job from README
jobs:
  maybe-build-android:
    runs-on: ubuntu-latest
    steps:
      - uses: sparkfabrik/[email protected]
        with:
          project-path: .
          output-path: my-app.apk
          browserstack-upload: false
          ruby-version: "2.7.5"
          bundler-version: "2.3.26"
          fastlane-env: "debug"