Simplify tar command

Author: zephyrie

.github/workflows/build_docs.yaml

@@ -41,7 +41,7 @@ jobs:
         sphinx-build -M html docs/monai-cloud-api/ docs/build/html
 
     - name: Tar build folder
-      run: tar -cvf build.tar -C docs/build/html
+      run: tar -cvf build.tar docs/build/html
 
     - name: Upload artifact
       uses: actions/upload-pages-artifact@v3