As per https://github.com/chakki-works/doccano/projects/2#card-16406087,
this change adds a Dockerfile for the project.
The Python distribution used by the image can be specified via a
build-time argument. This enables us in the future to for example run
the tests on a wide variety of Python versions.
In the future, the Dockerfile could be extended to for example leverage
multi-stage builds. In this case, the first stage could run tests,
linter, and so forth and then create a wheel or similar artifact via
setuptools. A second stage in the build can then only include a minimal
set of dependencies to install and run the artifact (e.g. using
python-slim as a base image).
Clemens Wolff