On github CI this creates .cache directory in the package

[Gozala]

As it was discovered in multiformats/js-multibase#61 (comment) it appears that running a playwright as github action causes .cache folder to be created in the package root, which then can end up in the npm. For more details here is the configuration of github workflow

https://github.com/Gozala/web-encoding/blob/363310221c17e29fbb67b2cac046272515322164/.github/workflows/node.js.yml#L44-L67

Putting .cache in the .npmignore works around this problem, but ideally that would no be required. At least section in the Readme would be helpful.