.travis.yml

# make use of vm's 
sudo: 'required'

# have the docker service set up (we'll
# update it later)
services:
  - 'docker'

# prepare the machine before any code
# installation scripts 

# first execute the test suite.
# after the test execution is done and didn't
# fail, build the images (if this step fails
# the whole Travis build is considered a failure).
script:
  - 'make echo'
  - 'make test'
  - 'make image'

# only execute the following instructions in
# the case of a success (failing at this point
# won't mark the build as a failure).
# To have `DOCKER_USERNAME` and `DOCKER_PASSWORD`
# filled you need to either use `travis`' cli 
# and then `travis set ..` or go to the travis
# page of your repository and then change the 
# environment in the settings pannel.
after_success:
  - if [[ "$TRAVIS_BRANCH" == "master" ]]; then
      docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD ;
      make push-image ;
    fi

# don't notify me when things fail
notifications:
  email: false