feat: Add is_renv_project criterion looking for an renv.lock file

[gadenbuie]

A small PR to add an is_renv_project criterion that finds an renv.lock file containing "Packages": {. I needed this in a project and thought it might be broadly useful to others.

I updated documentation but not the snapshot tests as I'm running into odd testthat and pkgload errors that are likely specific to my machine and that I don't have time to diagnose at the moment. Hopefully it'll be easy for you to update the snapshots.

[aviator-app]

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[aviator-app]

This pull request failed to merge: PR cannot be automatically rebased, please rebase manually to continue. Remove the blocked label to re-queue.

Additional debug info: Failed to rebase this PR onto the latest changes from the base branch. You will probably need to rebase this PR manually and resolve conflicts).

[krlmlr]

Yeah, updating the snapshot is tricky -- requires installing the package and running testthat::test_local(load_package = "none") . I can handle that.

[aviator-app]

This pull request failed to merge: PR cannot be automatically rebased, please rebase manually to continue. Remove the blocked label to re-queue.

Additional debug info: Failed to rebase this PR onto the latest changes from the base branch. You will probably need to rebase this PR manually and resolve conflicts).

[aviator-app]

This pull request failed to merge: some CI status(es) failed. Remove the blocked label to re-queue.

Failed CI(s): Smoke test: stock R

[krlmlr]

Thanks for the PR!