install devtools

Author: wing328

.github/workflows/samples-r.yaml

@@ -34,6 +34,10 @@ jobs:
         with:
           use-public-rspm: true
 
+      - name: Install devtools
+        run: install.packages("devtools")
+        shell: Rscript {0}
+
       - name: Build 
         run: devtools::build()
         shell: Rscript {0}