+## * docker-serve : use Docker to serve the site
+docker-serve :
+ docker pull carpentries/lesson-docker:latest
+ docker run --rm -it \
+ -v $${PWD}:/home/rstudio \
+ -p 4000:4000 \
+ -p 8787:8787 \
+ -e USERID=$$(id -u) \
+ -e GROUPID=$$(id -g) \
+ carpentries/lesson-docker:latest
+
+## * repo-check : check repository settings