Close #1319

Close #1312

Close #1301

This allows the user to specify that the env_file should override any
existing environment variables. This is not the default as the
environment the code runs it should take precedence.

* fix: prefer compatible packages

* add news

* Fix #1283

Support mutual TLS

* Don't use := in certfn defined test
Co-authored-by: NAndy Bailey <bailey@akamai.com>

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/PyCQA/flake8: 4.0.1 → 5.0.2](https://github.com/PyCQA/flake8/compare/4.0.1...5.0.2)
- [github.com/pre-commit/mirrors-mypy: v0.961 → v0.971](https://github.com/pre-commit/mirrors-mypy/compare/v0.961...v0.971)

* fix the linter error
Co-authored-by: Npre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: NFrost Ming <mianghong@gmail.com>

Fixes #1293.

Fix #1287

Fix #1283

* Add pdm export to available pre-commit hooks

* Add .pre-commit-hooks.yaml
* Update the doc

* Add news fragment with the PR number
Co-authored-by: NAndrea <floatingpurr@users.noreply.github.com>

* fix: Use description field from PEP 621 as summary

The "description" field corresponds to the core metadata "Summary"
field.

This fixes issue #1274.

See:
https://peps.python.org/pep-0621/#description
https://packaging.python.org/en/latest/specifications/declaring-project-metadata/#description

* Setup.update(): Do not hardcode all fields

Close #1270

This fixes #1276.

* doc: Fix formatting of `python.use_venv`

* feat: Introduce `pypi.ca_certs` config entry

Fix #1269

Close #1264