bonsai - add a dockerfile

src/bonsai/Dockerfile

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+# Build Bonsai .zip.
+# Usage:
+#    # While in `bonsai` folder.
+#    docker build -t bonsai-dist .
+#    # Output zip file will be in `dist` folder.
+#    # See possible values for variables in `Makefile`'s `dist` target description.
+#    docker run --rm -v "$PWD/../../:/work" -w /work -e PLATFORM=win -e PYVERSION=py313 bonsai-dist
+
+FROM ubuntu:24.04
+RUN apt-get update
+RUN apt-get install -y make git wget unzip zip
+
+# Python
+RUN apt-get install -y software-properties-common
+RUN add-apt-repository ppa:deadsnakes/ppa
+RUN apt-get update
+RUN apt-get install -y python3.11 python3.11-venv
+
+RUN apt-get install -y npm
+
+WORKDIR /work
+CMD cd src/bonsai && make dist PLATFORM=$PLATFORM PYVERSION=$PYVERSION