To use the docker environment clone this repo inside a folder structure like this:

some_directory <- Name is not important
  |- packages
     |- doofinder
        |- doofinder-magento2 <- This repo

And copy this repo's docker-compose.yml file to the root of the base directory (some_directory in the example) so you'll have:

some_directory <- Name is not important
  |- packages
  |  |- doofinder
  |     |- doofinder-magento2 <- This repo
  |- docker-compose.yml

Edit the copy of docker-compose.yml and set your tokens in the COMPOSER_AUTH environment variable.

Then run the environment by executing:

$ docker-compose up

from the base directory where the copy of docker-compose.yml is located.

Magento 2 with the module installed will be running at http://localhost:80.

The admin panel will be available at http://localhost:80/admin. Admin credentials are easy:

User: admin
Pass: admin123

To install sample data, with the containers running:

$ docker-compose exec app bash
root@...:~# cd $MAGENTO_PATH
root@...:/var/www/magento# gosu application php -d memory_limit=-1 ./bin/magento sampledata:deploy
root@...:/var/www/magento# gosu application php -d memory_limit=-1 ./bin/magento setup:upgrade