-The ruby and pronto installation is done in the `Dockerfile.base` container image. Thus, pronto and runners are portable and can be run easily locally or otherwise. The code and formatter for the GitHub Action itself are added in a subsequent container image, built by `Dockerfile`. This container image is built during the GitHub action run. That way, the large, base image can be downloaded and only the small modifications in this Action can be layered on top. This results in a faster GitHub Action run.
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