Use regular installation methods

.github/internal/install-shinyverse/action.yaml

@@ -22,14 +22,6 @@ inputs:
     description: Pandoc version to pass through
     default: "3.x"
     required: false
-  packagemanager-cran-url:
-    description: packagemanager url to be used for CRAN installations
-    default: "https://packagemanager.posit.co/cran/latest"
-    required: false
-  cran-url:
-    description: CRAN url to be used for CRAN installations
-    default: "https://cran.rstudio.com"
-    required: false
 runs:
   using: "composite"
   steps:
@@ -48,28 +40,12 @@ runs:
         sudo apt-get update
         sudo apt-get install -y libglpk-dev
 
-    # We need to have the first repo to be `shinyverse` repo, then RSPM, then cran-url
-    # Recreate logic from https://github.com/r-lib/actions/blob/413b6a4ba22b7bcaa726df1c8f88dcd574fbc8c4/setup-r/src/installer.ts#L598-L670
-    # * Do not set RSPM input (use-public-rspm: false) to make `CRAN` repo the first repo
-    # * Set CRAN env so that `packagemanger` repo is first
-    # * Add backup of `cran-url` in `extra-repositories`
-    # * Do not set RSPM envvar pointing to `packagemanager-cran-url` as it will make `RSPM` repo the first repo
     - name: Install R and shinycoreci
       uses: rstudio/shiny-workflows/setup-r-package@v1
-      env:
-        CRAN: ${{ inputs.packagemanager-cran-url }}
       with:
         r-version: ${{ inputs.r-version }}
         cache-version: ${{ inputs.cache-version }}
         http-user-agent: ${{ inputs.http-user-agent }}
         pandoc-version: ${{ inputs.pandoc-version }}
         extra-packages:
           ${{ inputs.extra-packages }}
-        use-public-rspm: false
-        extra-repositories: |
-          ${{ inputs.cran-url }}
-
-    - name: Show repos
-      shell: Rscript {0}
-      run: |
-        print(getOption("repos"))