Start building Python 3.13 container for tests

Author: brandon-rhodes

containers/3.13/Dockerfile

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+FROM python:3.13-slim
+WORKDIR /work
+
+RUN pip install https://github.com/brandon-rhodes/assay/archive/master.zip
+RUN pip install certifi jplephem numpy pandas sgp4
+
+CMD ["bash", "-c", "PYTHONPATH=$PWD ./test-code.sh"]

containers/3.13/run

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+#!/bin/bash
+
+name=skyfield-3.13
+
+set -e
+cd "$(readlink -f $(dirname "${BASH_SOURCE[0]}"))"
+podman build -t $name .
+exec podman run -it \
+     -v $PWD/../..:/work \
+     $name