To test it locally:
docker run -t --volume="$PWD:/srv/jekyll" -p 4000:4000 -t jekyll/jekyll:3.8 bash -c "jekyll serve"
To build production statics:
docker run -t --volume="$PWD:/srv/jekyll" --env JEKYLL_ENV=production jekyll/jekyll:3.8 bash -c "jekyll build --trace"
Trick: add --volume="$PWD/../bundle:/usr/local/bundle" to reduce installation time.