Just sudo so people can instantiate asciidoctor in the container as the user they are running their stuff.
E.g. a script such as asciidoctor.sh is impossible to write:
docker run --rm \
-v $PROJECT_FOLDER:/documents \
-v /etc/passwd:/etc/passwd:ro \
-v /etc/group:/etc/group:ro \
/usr/bin/sudo -E -u "#$(id -u)" "/usr/local/bin/asciidoctor" "$@"
Seems reasonable to me. @gscheibel, any comments?
Thanks @bmustiata for the PR