Build the images from this directory using:

    cd $REPO_HOME
    cd images/ckan-base
    docker build -t ckan/ckan-base:testing-only-2.9 -f 2.9/Dockerfile .
    docker push ckan/ckan-base:testing-only-2.9
    docker build -t ckan/ckan-base:testing-only-2.8 -f 2.8/Dockerfile .
    docker push ckan/ckan-base:testing-only-2.8
    docker build -t ckan/ckan-base:testing-only-2.7 -f 2.7/Dockerfile .
    docker push ckan/ckan-base:testing-only-2.7