Use repo pak on macOS devel

Author: VisruthSK

.github/workflows/R-CMD-check.yaml

@@ -33,7 +33,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macOS-latest, r: 'devel', opencl: true}
+          - {os: macOS-latest, r: 'devel', opencl: true, pak: 'repo'}
           - {os: macOS-latest, r: 'release', opencl: true}
           - {os: macos-26, r: 'release', opencl: false}
           - {os: macos-15-intel, r: 'release', opencl: false}
@@ -75,6 +75,7 @@ jobs:
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
           cache: "always"
+          pak-version: ${{ matrix.config.pak || 'stable' }}
           extra-packages: any::rcmdcheck, local::.
 
       - name: Debug Windows toolchain resolution