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doc: how do install in alpine/container

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@ -389,6 +389,82 @@ for more details on how the selection works and more information on its usage.
----
### Usage in alpine container
This installs pyenv, pyenv-virtualenv, pyenv-doctor and pyenv-update; python 3.13 and 3.12; makes python3.13 the version you get when running `python3`.
~~~dockerfile
FROM alpine:latest
# The the installed versions, this can be combined with the next comment and renovate to get automated updates in your CI. If you do not use renovate remove the `# renovate:` lines.
# renovate: datasource=github-tags depName=pyenv/pyenv versioning=semver
ENV PYENV_CMD_VERSION="v2.4.22"
# renovate: datasource=github-tags depName=pyenv/pyenv-virtualenv versioning=semver
ENV PYENV_VITUALENV_VERSION="v1.2.4"
# Keep the version first which you want to have available via `python3` or `python`, the versions after that are available as e.g. `python3.12`.
# We check the version accessible via `python3` in the last RUN, so be sure to update the version there too.
ENV INSTALLED_PYTHON_VERSIONS="3.13 3.12"
# Set/extend environment variables:
ENV PYENV_ROOT="/root/.pyenv"
ENV PATH="${PYENV_ROOT}/shims:${PYENV_ROOT}/bin:$PATH"
# install pyenv and dependencies:
RUN apk upgrade --no-cache && \
apk add \
bash \
git \
build-base \
linux-headers \
&& \
apk add --no-cache build-base zlib-dev openssl-dev libffi-dev readline-dev bzip2-dev ncurses-dev xz-dev sqlite-dev tk-dev --virtual pyenv-build-deps \
&& \
git clone -c advice.detachedHead=0 --depth 1 --branch "${PYENV_CMD_VERSION}" https://github.com/pyenv/pyenv.git "${PYENV_ROOT}" && \
git clone -c advice.detachedHead=0 --depth 1 --branch "${PYENV_VITUALENV_VERSION}" https://github.com/pyenv/pyenv-virtualenv.git "${PYENV_ROOT}/plugins/pyenv-virtualenv" && \
git clone -c advice.detachedHead=0 --depth 1 https://github.com/pyenv/pyenv-doctor.git "${PYENV_ROOT}/plugins/pyenv-doctor" && \
git clone -c advice.detachedHead=0 --depth 1 https://github.com/pyenv/pyenv-update.git "${PYENV_ROOT}/plugins/pyenv-update" && \
printf 'export PYENV_ROOT="$HOME/.pyenv"\n' >> ~/.profile && \
printf 'command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"\n' >> ~/.profile && \
printf 'eval "$(pyenv init -)"\n' >> ~/.profile && \
eval "$(pyenv init -)" && \
pyenv doctor
# Build python versions from INSTALLED_PYTHON_VERSIONS:
# depending on the container image builder you might have remove the `--mount...` stuff, this allows having the builds cached in a common place.
# When you build the image more often you get quite some speed improvements.
RUN --mount=type=cache,mode=777,id=pyenv,target=/var/cache/pyenv \
for python_version in ${INSTALLED_PYTHON_VERSIONS}; do PYTHON_BUILD_CACHE_PATH=/var/cache/pyenv pyenv install "${python_version}"; done
# Set the global versions and run `python3.xxx --version` to show the full version that has been installed (not just 3.11)
RUN pyenv global ${INSTALLED_PYTHON_VERSIONS} && \
for python_version in $(echo "${INSTALLED_PYTHON_VERSIONS}" | sed 's,-dev,,g') ; do python${python_version} --version ; which python${python_version} ; done && \
apk del pyenv-build-deps # remove the packages only required for the build
RUN python3 --version | grep -q "Python 3.13" || { echo "Python version is not correct when running python3" ; exit 1 ;}
~~~
Unrelated to pyenv, if you use renovate to update the versions above add this to its config (`renovate.json5`):
~~~json5
{
$schema: "https://docs.renovatebot.com/renovate-schema.json",
// variants are described in the README.md
customManagers: [
{
customType: "regex",
fileMatch: ["(^|/|\\.)Dockerfile$", "(^|/)Dockerfile\\.[^/]*$"],
matchStrings: [
'#\\s*renovate:\\s*datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?( extractVersion=(?<extractVersion>.*?))?( registryUrl=(?<registryUrl>.*?))?( sourceUrl=(?<sourceUrl>.*?))?\\sENV .*?_VERSION="(?<currentValue>.*)"\\s',
],
versioningTemplate: "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}",
},
],
}
~~~
----
### Uninstall Python versions
As time goes on, you will accumulate Python versions in your