stacker-build-push-action/test/stacker.yaml

# container name
test:
    from:
        type: docker
        url: docker://centos:latest
    run: |
        echo "echoing substitutes"
        echo "${{SUB1}}"
        echo "$SUB2"
        echo "$SUB3"
        ls -al /
        echo "Your layer is ${STACKER_LAYER_NAME}"
        echo "success"