...
/usr/local/bundle/gems/jekyll-sass-converter-1.5.2/lib/jekyll/converters/scss.rb:86:in `chdir': No such file or directory @ dir_chdir0 - /github/workspace/docs (Errno::ENOENT)
A few lines before it shows the repo mounted to /github/workspace/:
...
"/home/runner/work/norns/norns":"/github/workspace" ghcr.io/actions/jekyll-build-pages:v1.0.13
But, the doc directory is actually at norns/doc and not norns/docs which would appear to be the reason for this failure. The action itself looks new and possibly still under construction?