Drone setup for deploying every branch to Dokku

deploy.sh

#!/bin/bash

if [ $DRONE_BRANCH ]; then
  git fetch --unshallow
  git remote remove dokku
  git remote add dokku dokku@foo.dokkuhost.com:project-bar-$DRONE_BRANCH
  git push dokku $DRONE_BRANCH:master
fi

drone.yml

image: phusion/passenger-full
script:
  - sudo apt-get update
  - gem install sass
  - npm config set loglevel warn
  - npm install -g grunt-cli
  - npm install
  - npm test
deploy:
  bash:
    command: './deploy'

git fetch --unshallow is necessary, as the first push to a new feature branch will attempt to push to an empty repo on dokku. Subsequently it isn't necessary, so you could theoretically improve this by checking the dokku remote before fetching.