bundle install
cp .app-env-dist .app-env
script/server
Then access over http://localhost:3030
As pi on your raspberry pi:
(cd ~; [ -d dashing ] && rm -fr dashing ; git clone https://github.com/websages/dashboards-bnagh dashing; sudo dashing/INSTALL)
will set up the device to boot into dashing.
You will need to enable boot-to-graphical mode with raspi-config as well.
Any secrets should be exported to the environment in /home/pi/.app-env.