Add docker files

docker/Dockerfile

+FROM python:3.9
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update
+RUN apt-get install -y apt-utils
+RUN apt-get install -y appstream-util
+RUN apt-get install -y libgirepository1.0-dev
+RUN apt-get install -y gir1.2-gtk-3.0
+RUN apt-get install -y gir1.2-soup-2.4
+RUN apt-get install -y gettext
+
+RUN adduser --disabled-password worker
+WORKDIR /home/worker
+ENV PATH="/home/worker/.local/bin:${PATH}"
+USER worker
+
+RUN pip install --upgrade pip
+
+COPY --chown=worker:worker requirements.txt requirements.txt
+RUN pip install --no-cache-dir --user -r requirements.txt
+
+CMD bash

docker/requirements.txt

+PyGObject
+mypy
+pylint
+codespell
+coverage
+css-parser
+keyring
+packaging
+precis-i18n
+pyOpenSSL
+types-pkg_resources
+requests
\ No newline at end of file