(I use the latest Docker beta on OSX, but this should work on any recent Docker installation.)
Here is the Dockerfile:
RUN dnf -y install nodejs python2 make gcc gcc-c++
RUN npm install -g pico-engine
Run this command (in the folder where you saved Dockerfile) to build the docker image:
docker build -t pico-engine .
Run this command to start your pico-engine in docker:
docker run -it -p 8084:8084 -e PORT=8084 pico-engine
It should start up and report the URL: http://localhost:8084. Now you can follow the instructions on https://picolabs.atlassian.net/wiki/display/docs/Pico+Engine+Quickstart#suk= -- skip the "Install and run..." section.
Console messages will appear in the console where you ran docker.