Install Samson on Dokku

Required local modifications are in the following pull request: https://github.com/cu12/samson/pull/1

dokku apps:create samson
docker pull mysql:5.6
export MYSQL_IMAGE_VERSION="5.6"
dokku mysql:create samson
dokku mysql:link samson samson
dokku config:set samson GITHUB_TOKEN=<token> \
                        GOOGLE_CLIENT_ID=<clientid> \
                        GOOGLE_CLIENT_SECRET=<client_secret> \
                        # Omitting slack plugin \
                        PLUGINS=ALL,-slack \
                        RACK_ENV=production \
                        RAILS_ENV=production \
                        SECRET_TOKEN=<secret_token> \
                        AUTH_GITHUB=0 \
                        AUTH_LDAP=0 \
                        DATABASE_NAME=samson
deploy...
dokku run samson bundle exec rake db:setup