I got tripped up by two important differences between the README and how things behave:

1. Github Pages are now on github.io (not github.com)
2. Helm expects the directory name where the chart is (so alpine and not mychart here)

@daaain
Can we do this for any git repo or just with github? I tried the same with a gitlab repo and doesn't work. Did it work for you?

Can we do this for any git repo or just with github? I tried the same with a gitlab repo and doesn't work. Did it work for you?

I don't know much about working with Gitlab, but they do also seem to have Pages:
https://docs.gitlab.com/ee/user/project/pages/

But even if that didn't work, you can also deploy to a (free) static host like Netlify, Firebase Hosting, etc with a few lines of CI script.