fix: parse_image_id: Process "docker build" output in reverse line order #400
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When using a custom dockerfile which installs Python modules using pip, the output will sometimes contain the line:
Since this matches one of the regexes in parse_image_id, it causes the module name to be incorrectly identified as the image ID, which will cause kitchen-docker to fail the "docker run" as it will not have a valid Docker image ID.
This commit processes the "docker build" output in reverse line order, which will ensure that the correct line is matched.
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