Follow the instructions provided by Resin.io to get a working Arch Linux install with Docker running on your raspberry pi.
Build the image:
$ git clone https://github.com/jontg/docker-ulfhedinn.git
$ pushd docker-ulfhedinn/images/tt-rss
$ docker build -rm -t rpi-tt-rss .
$ popd
Run the image:
$ ./bin/run.sh
root@7bd591a864c3:/# /usr/bin/mysql -u root -ptt-rss --database ttrss < /backups/2014-01-21.sql
Yay Docker. Yay Resin.io. Yay Reinhard Seiler.