Test GHA

Author: jeroen

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

@@ -31,6 +31,13 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - if: runner.os == 'windows'
+        run: |
+          if(Test-path c:\\rtools40){
+            echo "rtools40 is preinstalled"
+          } else {
+            choco install --verbose rtools --version 4.0.0.20220206
+          }
       - if: matrix.config.os == 'ubuntu-18.04'
         run: sudo add-apt-repository ppa:cran/opencv-3.4