renv + pak doesn't work with r-universe repos

[Aariq]

It seems like maybe the repos argument isn't getting passed to pak correctly or something? renv::restore() seems to fail when the lockfile contains R packages installed from r-universe.

To reproduce:

1. Create a new RStudio project
2. install azmetr from r-universe with install.packages("azmetr", repos = c("https://cct-datascience.r-universe.dev", "https://cloud.r-project.org"))
3. Create an R script with library(azmetr) in it
4. Run renv::init() + renv::snapshot()
5. Run options(renv.config.pak.enabled = TRUE)
6. Run renv::restore()

Resulting error message:

Error:                                                                                       
! error in pak subprocess
Caused by error: 
! Could not solve package dependencies:
* azmetr@0.4.0: Can't find package called [email protected].
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
* [email protected]: dependency conflict
Type .Last.error to see the more details.
Traceback (most recent calls last):
6: renv::restore()
5: renv_pak_restore(lockfile = lockfile, packages = packages, exclude = exclude, 
       prompt = prompt, project = project)
4: pak$pkg_install(pkg = remotes, ask = prompt)
3: remote(function(...) get("pkg_install_make_plan", asNamespace("pak"))(...), 
       list(pkg = pkg, lib = lib, upgrade = upgrade, ask = ask, 
           start = start, dependencies = dependencies, loaded = loaded_packages(lib)))
2: err$throw(res$error)
1: base::stop(cond)

sessionInfo()

R version 4.4.1 (2024-06-14)
Platform: x86_64-apple-darwin20
Running under: macOS 15.3.1

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.4-x86_64/Resources/lib/libRlapack.dylib; LAPACK version 3.12.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: America/Phoenix
tzcode source: internal

attached base packages:
[1] stats graphics grDevices datasets utils methods base

loaded via a namespace (and not attached):
[1] compiler_4.4.1 tools_4.4.1 renv_1.1.1 pak_0.8.0