treat requirements.txt as a pep621 artifact

[hmoffatt]

How are you running Renovate?

Self-hosted Renovate

Which platform you running Renovate on?

Gitea

Which version of Renovate are you using?

42.26.2

Please tell us more about your question or problem

I am using pdm to manage my Python packages, and I am also exporting the package list to requirements.txt via

[tool.pdm.scripts]
post_install = "{pdm} export --prod -o requirements.txt"

I configured renovate to ignore requirements.txt, since it's generated, but I would like it to include it as an artifact in PRs, like it does updates to pdm.lock.

Logs (if relevant)

Logs

DEBUG: Updated 1 lock files (repository=systems/ansible, branch=renovate/ansible-lint-25.x)
"updatedArtifacts": ["pdm.lock"]

[Churro]

To achieve this, you'll need to define postUpgradeTasks with fileFilters.