Use pip install --isolated when bootstrapping pip/Poetry#434
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So that any invalid global pip config (set via either `PIP_*` env vars or global pip config files in the HOME directory) don't affect/break the bootstrapping of the package managers. (Such config is still loaded during the later `pip install` used to install the app's own dependencies; this change only affects the internal buildpack bootstrapping stage.) We don't have to update the uv installation step, since that doesn't use pip, since uv is a Rust binary installed from GitHub Releases. This is the CNB equivalent of: heroku/heroku-buildpack-python#1915 See: - https://pip.pypa.io/en/stable/cli/pip/#cmdoption-isolated - https://pip.pypa.io/en/stable/topics/configuration/ GUS-W-19770487.
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## heroku/python ### Changed - Changed the `pip install` commands used to install the pip and Poetry package managers to now use `--isolated` mode. ([#434](#434)) - Added more Python project related file and directory names to the list recognised by buildpack detection. ([#435](#435)) - Updated uv from 0.8.20 to 0.8.23. ([#431](#431) and [#436](#436))
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## heroku/python ### Changed - Changed the `pip install` commands used to install the pip and Poetry package managers to now use `--isolated` mode. ([#434](heroku/buildpacks-python#434)) - Added more Python project related file and directory names to the list recognised by buildpack detection. ([#435](heroku/buildpacks-python#435)) - Updated uv from 0.8.20 to 0.8.23. ([#431](heroku/buildpacks-python#431) and [#436](heroku/buildpacks-python#436))
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So that any invalid global pip config (set via either
PIP_*env vars or globalpip.confconfig files in the HOME directory) don't affect/break the bootstrapping of the package managers.(Such config is still loaded during the later
pip installused to install the app's own dependencies; this change only affects the internal buildpack bootstrapping stage.)We don't have to update the uv installation step, since that doesn't use pip, since uv is a Rust binary installed from GitHub Releases.
This is the CNB equivalent of:
heroku/heroku-buildpack-python#1915
See:
GUS-W-19770487.