Try mimicking local install again.

.github/workflows/pkgdown.yml

@@ -99,7 +99,10 @@ jobs:
           # Render site
           render_site <- function(){
             if(file.exists('vignettes/qc.Rmd')){
-              pkgdown::build_site(new_process = FALSE)
+              #pkgdown::build_site(new_process = FALSE) # `new_process` because otherwise errors go unlogged
+              pkgdown::init_site()
+              devtools::load_all() # try to mimic the local installation that pkgdown::build_site does but pkgdown::build_article does not
+              pkgdown::build_article(name = 'qc')
               file.rename(from = 'vignettes/qc.Rmd', to = 'vignettes/_qc.Rmd')
               # This last step is not necessary now but, if we ever want to combine actions,
               # it's better to restore the original name of the file.