Just a hodgepodge of Dockerfile goodness
build (within image specific folder)
docker build -t westonplatter/ruby-nodejs-postgres:2.3.1 .
push to docker hub
docker push westonplatter/ruby-nodejs-postgres:2.3.1
build (within image specific folder)
docker build -t westonplatter/ruby-nodejs-postgres:2.3.1 -f Dockerfile-ruby-2.3.1
pust to docker hub
docker push westonplatter/ruby-nodejs-postgres:2.3.1