there's also https://github.com/cdarwin/go-koans for small go exercises.

you may have issues running in Docker; when i last touched this i needed to modify docker.sh:

  -docker run --rm -ti -v "$PWD":/usr/src/koans -w /usr/src/koans golang:1.6.0-alpine go test
  +docker run --rm -ti -e GO111MODULE=off -v "$PWD":/usr/src/koans -w /usr/src/koans golang:1.18-alpine go test