adding --as-cran to yaml for mac and windows

Author: cmjt

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

@@ -44,4 +44,5 @@ jobs:
 
       - uses: r-lib/actions/check-r-package@v2
         with:
-          upload-snapshots: true
+          upload-snapshots: true
+	  args: ' --as-cran'