[Question/Idea] Is it possible to use gh-page data.js content as cached value?

I would like to compare the PR's benchmark with the master one,

My ideia is: instead use a cache, to try something with:

```
- name: Get previous benchmark data
run: |
echo "Fetching gh-pages branch"
git fetch origin gh-pages

echo "Checking out gh-pages branch"
git checkout gh-pages

if [ ! -d "./cache" ]; then
echo "Cache folder does not exist, creating it"
mkdir ./cache
fi

echo "Copying data file from gh-pages to cache"
cp ./dev/bench/data.js ./cache/data.js || { echo "Failed to copy data file" ; exit 1; }

echo "Checking out main branch"
git checkout -
```

an then run the benchmark action with minimal setup, using this content as the json external file.