Add clean up step to remove unnecessary directories before upload the data

Author: ingwonsong

.github/workflows/test.yml

@@ -57,6 +57,15 @@ jobs:
         -c opt
         $(bazel query 'kind(.*wasm_.*_binary, //test/test_data/...)')
 
+    - name: Clean up test data
+      run: |
+        # Remove temporal directories
+        for i in $(cd test/test_data && ls -1); do \
+          if [ -d "test/test_data/$i" ]; then \
+            rm -rf test/test_data/$i \
+          fi \
+        done
+
     - name: Upload test data
       uses: actions/upload-artifact@v2
       with: