Set working-directory

Author: kateinoigakukun

.github/workflows/main.yml

@@ -134,9 +134,9 @@ jobs:
           name: macos-installable
           path: ../swift-wasm-DEVELOPMENT-SNAPSHOT-osx.tar.gz
       - name: Pack test results
+        working-directory: ${{ github.workspace }}/../
         run: |
-          cd ../
-          tar cJf swift-test-results.tar.gz target-build/*/swift-macosx-x86_64/swift-test-results
+          tar cJf ./swift/swift-test-results.tar.gz target-build/*/swift-macosx-x86_64/swift-test-results
       - name: Upload test results
         uses: actions/upload-artifact@v1
         with: