如何在一个docker镜像上安装两个版本的python，并在构建时切换它们

我需要创建一个docker图像，其中包含两个版本的Python，比如说3.9&amp；3.10.

我们的 idea 是安装这两个版本的Python，然后安装来自Python3.9的pip/heel/lib目录，因为它是我们想要使用的默认版本.然后，我创建了指向pip/heel/lib目录的sys链接.

然后，使用.sh脚本，我们将通过构建参数传递Python版本，并使用该ARG，我们将 Select 替代版本的Python，本例中为10，这将使3.10版本成为构建使用的版本.

但我不确定做这件事的最好方法是dockerfile.

我的文档文件如下所示:

COPY --from=python1 --chown=developer:developer /usr/local/bin/py* /usr/local/bin/
COPY --from=python1 --chown=developer:developer /usr/local/bin/pip* /usr/local/bin/
COPY --from=python1 --chown=developer:developer /usr/local/bin/wheel /usr/local/bin/
COPY --from=python1 --chown=developer:developer /usr/local/lib/lib* /usr/local/lib/

RUN for link in /usr/local/bin/py* /usr/local/bin/pip* /usr/local/bin/wheel /usr/local/lib/lib*; do \
        [ -e "$link" ] || ln -s "$link" /usr/local/bin/; \
    done

# Copy Base Python Version
COPY --from=python1 --chown=developer:developer /usr/local/lib/python3.9/ /usr/local/lib/python3.9/

# Copy Alternative Python Version
COPY --from=python2 --chown=developer:developer /usr/local/lib/python3.10/ /usr/local/lib/python3.10/

# Copy the version-switching script
COPY sagacity-cd/swap.sh /usr/local/bin/

# Run the script to set the default version based on the build argument
USER root
RUN chmod +x /usr/local/bin/swap.sh && \
    /usr/local/bin/swap.sh ${DEFAULT_PYTHON_VERSION}
USER developer

# Copy the version-switching script
COPY sagacity-cd/swap.sh /usr/local/bin/

# Run the script to set the default version based on the build argument
USER root
RUN chmod +x /usr/local/bin/swap.sh && \
    /usr/local/bin/swap.sh ${DEFAULT_PYTHON_VERSION}
USER developer 

我的swap.sh如下所示:

#!/bin/bash

if [ "$1" == "3.9" ]; then
    rm /usr/local/bin/python
    ln -s /usr/local/bin/python3.9 /usr/local/bin/python
elif [ "$1" == "3.10" ]; then
    rm /usr/local/bin/python
    ln -s /usr/local/bin/python3.10 /usr/local/bin/python
else
    echo "Invalid version specified. Usage: $0 [3.9|3.10]"
    exit 1
fi