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This change moves the virtualenv creation in the `Dockerfile` to a separate stage, to simplify isolating the process and reduce the need for uninstalling build dependencies. The approach is similar to the one explained in [1]. It relies on building a virtualenv folder, and copying it in the final stage. Changing the `PATH` environment variable makes the virtualenv usable by default, without affecting the default Python installation. Also, added Dockerfile arguments for Alpine, nginx, and Python versions, as some of them are reused, and also simplifies testing new versions. An extra side effect is that the image size for the final stage is reduced from 315MB to 262MB. [1] https://scribe.rip/@albertazzir/blazing-fast-python-docker-builds-with-poetry-a78a66f5aed0