update

.github/workflows/deploy_bookdown.yml

@@ -78,7 +78,10 @@ jobs:
           path: book-content/_bookdown_files
           key: bookdown-${{ hashFiles('**/*Rmd') }}
           restore-keys: bookdown-
-
+      
+      - name: Install packages
+        run: Rscript -e 'install.packages(c("rmarkdown","bookdown"))'
+      
       - name: Build site
         run: Rscript -e 'bookdown::render_book("book-content", quiet = TRUE)'