如何在GitHub动作中使用环境VAR？

Question

env:
  APP_PATH: ${{ github.workspace }}/MyApp/Build/Applications/MyApp.app

jobs:
  build:
    runs-on: macos-latest

    steps:
      - name: Upload app
        uses: svenstaro/upload-release-action@v2
        with:
          file: ${APP_PATH}

这将失败：

Error: ENOENT: no such file or directory, stat '${APP_PATH}'

docs> docs 说要使用，例如$ day_of_week，但行不通。我已经尝试过$ app_path，$ {app_path}和$ {{app_path}}}。