Add the black package

black/.gitignore

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+functions.sh

black/Dockerfile

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+FROM python:3-alpine
+
+RUN pip install black
+
+WORKDIR /apps
+
+ENTRYPOINT ["black"]
+CMD ["--help"]

black/README.md

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+# black
+Auto-trigger docker build for [black](https://black.readthedocs.io/en/stable) when new release is announced
+
+Multi-arch supported (linux/arm/v7,linux/arm64/v8,linux/arm/v6,linux/amd64,linux/ppc64le,linux/s390x)
+
+
+### Repo:
+
+https://github.com/alpine-docker/multi-arch-libs/blob/master/black/Dockerfile
+
+### Daily build logs:
+
+Docker images are built together:
+
+https://app.circleci.com/pipelines/github/alpine-docker/multi-arch-libs
+
+Image list:
+
+https://github.com/alpine-docker/multi-arch-libs/tree/master#image-details
+
+### Docker iamge tags:
+
+https://hub.docker.com/r/alpine/black/tags/
+
+# Usage:
+
+    # must mount the local folder to /apps in container.
+    docker run -ti --rm -v $(pwd):/apps alpine/black local_file.py
+
+    # run flake8 container as command
+    alias black="docker run -ti --rm -v $(pwd):/apps alpine/black"
+    black --help
+    black local_file.py
+
+# The Processes to build this image
+
+* Enable CI cronjob on this repo to run build regularly on master branch (Weekly)
+* Build and push the images with latest version
+* Run the latest image locally and get the application version
+* Tag the image with the version, from previous step
+* push the image with version via tool called [crane](https://github.com/google/go-containerregistry/blob/main/cmd/crane/doc/crane.md)

black/version-tag.sh

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+#!/usr/bin/env bash
+
+curl -H "Cache-Control: no-cache" -sL "https://raw.githubusercontent.com/alpine-docker/multi-arch-libs/stable/functions.sh" -o functions.sh
+source functions.sh
+
+image="alpine/black"
+
+version=$(docker run -ti --rm ${image} --version | head -n 1 | awk '/black,/{print $2}')
+
+install_crane
+./crane copy ${image} ${image}:${version}