Per Brian Van Klaveren, here's the starting code template for .travis.yaml at the top level directory of imgserv:

language: python

services:

• docker

before_install:

• BRANCH=$(if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then echo $TRAVIS_BRANCH; else echo $TRAVIS_PULL_REQUEST_BRANCH; fi)
• docker build . -t webserv/imgserv:$BRANCH

script:

• docker run webserv/imgserv:$BRANCH /bin/bash -c 'cd /app/tests; source /opt/lsst/software/stack/loadLSST.bash; setup lsst_distrib; flake8'
• docker run webserv/imgserv:$BRANCH /bin/bash -c 'cd /app/tests; source /opt/lsst/software/stack/loadLSST.bash; setup lsst_distrib; pytest'

after_success:

• docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
• docker push webserv/imgserv:$BRANCH