Add the Dockerfile to build the docker brenard/mylib:dev-master image

docker/dev-master/Dockerfile

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+FROM brenard/mylib:latest
+RUN apt-get remove -y python3-mylib
+RUN python3 -m pip install -U git+https://gitea.zionetrix.net/bn8/python-mylib.git

docker/latest/Dockerfile

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+FROM debian:latest
+RUN echo "deb http://debian.zionetrix.net stable main" > /etc/apt/sources.list.d/zionetrix.list
+RUN apt-get -o Acquire::AllowInsecureRepositories=true -o Acquire::AllowDowngradeToInsecureRepositories=true update
+RUN apt-get -o APT::Get::AllowUnauthenticated=true install --yes zionetrix-archive-keyring
+RUN apt-get update
+RUN apt-get install -y python3-all python3-dev python3-pip python3-venv python3-mylib build-essential git
+RUN python3 -m pip install pylint pytest flake8 flake8-junit-report pylint-junit junitparser