ansible/test/integration/targets/docker_stack/vars/main.yml

stack_compose_base:
    version: '3'
    services:
        busybox:
            image: quay.io/ansible/docker-test-containers:busybox
            command: sleep 3600

stack_compose_overrides:
    version: '3'
    services:
        busybox:
            environment:
                envvar: value

stack_update_expected_diff: '{"test_stack_busybox": {"TaskTemplate": {"ContainerSpec": {"Env": ["envvar=value"]}}}}'