GA: Need to install package for it's built-in 'self' vignette engine

Author: HenrikBengtsson

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

@@ -59,8 +59,10 @@ jobs:
           sudo -s eval "$sysreqs"
 
       - name: Install dependencies
-        run: Rscript -e "library(remotes)" -e "update(readRDS('depends.Rds'))" -e "remotes::install_cran('rcmdcheck')"
-
+        run: |
+	  Rscript -e "library(remotes)" -e "update(readRDS('depends.Rds'))" -e "remotes::install_cran('rcmdcheck')"
+	  Rscript -e "install.packages('progressr')"  ## 'self' vignette engine
+	  
       - name: Check
         run: Rscript -e "rcmdcheck::rcmdcheck(args = '--no-manual', error_on = 'warning', check_dir = 'check')"