Make poetry image standalone
poetry dev image is currently based on the image built for Silkaj CI. Silkaj CI images are probably going to be switch to Alpine docker/python3/poetry#11+. Therefore poetry dev image has the choice to be based on Alpine, but this would be not very user friendly for contributors not at ease with something else than Debian. Therefore, making this image standalone, directly built on top of Python Debian-slim image, installing `poetry`, `git`, `pre-commit` should be done. This is blocking docker/python3/poetry#11. ### Tasks - [ ] Make `image/poetry` standalone - [ ] Switch default built image to latest Python version available (3.14) - [ ] Move `pre-commit` and `git` installation from Py3.12 to Py3.1(4?) image, synchronize with DuniterPy’s CI.
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