Allow setup-r-dependencies to accept working-directory or similar functionality

[TNonet]

I am in the process of moving my package's, L0Learn, CI/CD to GitHub Actions. Currently, I am facing an issue where setup-r-dependencies fails because the R package is in a sub-directory of my repo.

The cause of this issue is found here as the directory that pak inspects for dependencies is hardcoded as local::.:

actions/setup-r-dependencies/action.yaml

Line 24 in fd9a09a

saveRDS(pak::pkg_deps("local::.", dependencies = TRUE), ".github/r-depends.rds")

I am rather new to using Github Actions, so I am unsure of which of these solutions (if any) would be better:

• Makesetup-r-dependencies action aware of the working-directory parameter in the greater "workflow action scope"
• Create a new input parameter for subdirectories similar to how install_github from devtools(https://www.rdocumentation.org/packages/devtools/versions/1.13.6/topics/install_github)

Error: Error: <callr_remote_error: Cannot install packages:
  * local::.: No root directory found in /Users/runner/work/L0Learn/L0Learn or its parent directories. Root criterion: contains a file "DESCRIPTION" with contents matching "^Package: ">
   in process 20845 
  -->
  <simpleError: Cannot install packages:
  * local::.: No root directory found in /Users/runner/work/L0Learn/L0Learn or its parent directories. Root criterion: contains a file "DESCRIPTION" with contents matching "^Package: ">

I would be happy to submit a PR for this change, if this new functionality is deemed valuable.
Meanwhile, are there any workarounds for this issue?

[github-actions]

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