Carthage のandstor/file-existence-action@v1 GitHubActionで

      # Carthageの変更を見る
      - name: Cache Carthage
        uses: actions/cache@v1.1.2
        id: cache-carthage
        with:
          path: Carthage
          key: ${{ runner.os }}-carthage-${{ hashFiles('**/Cartfile.resolved') }}
          restore-keys: |
            ${{ runner.os }}-carthage-
     
      # Carthageのファイルあるか確認
      - name: Check Carthage file existence
        id: check_files
        uses: andstor/file-existence-action@v1
        with:
          files: "ios/Cartfile"

      # Carthageコマンド実行、ただし、ファイルあれば
      - name: Carthage
        if: steps.cache-carthage.outputs.cache-hit != 'true' && steps.check_files.outputs.files_exists == 'true'
        run: carthage bootstrap --platform iOS --no-use-binaries --cache-builds