R-CMD-check workflow doesn't install quarto cli. It only installs pandoc. The quarto R package needs the quarto cli to render .qmd vignettes. So add a quarto-dev/quarto-actions/setup@v2 step

Author: divine7022

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

@@ -33,6 +33,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - uses: quarto-dev/quarto-actions/setup@v2
+
       - uses: r-lib/actions/setup-pandoc@v2
 
       - uses: r-lib/actions/setup-r@v2