Is your feature request related to a problem? Please describe.
The action r-lib/actions/setup-renv supports the working-directory input. However, it is not not possible to use r-version: renv in r-lib/actions/setup-r when the renv.lock file is not in the main directory.

Describe the solution you'd like
Add support for a working-directory input in r-lib/actions/setup-r, or maybe a lockfile-path to be more precise.

Describe alternatives you've considered
Workaround implies either setting the r version manually or copying the renv.lock file into the main folder before setting up R.

Additional context
Example of how it works now:

steps:
  - name: Checkout repo
    uses: actions/checkout@v4

  - name: Setup R
    uses: r-lib/actions/setup-r@v2
    with:
      r-version: "4.0.3" #manually set

  - name: Setup R dependencies
    uses: r-lib/actions/setup-renv@v2
    with:
      working-directory: ./src #supported input

Requested feature:

steps:
  - name: Checkout repo
    uses: actions/checkout@v4

  - name: Setup R
    uses: r-lib/actions/setup-r@v2
    with:
      r-version: renv
      working-directory: ./src #same as setup-renv

  - name: Setup R dependencies
    uses: r-lib/actions/setup-renv@v2
    with:
      working-directory: ./src