Update blank.ml with ocaml-setup

.github/workflows/blank.yml

@@ -22,6 +22,9 @@ jobs:
       # Runs a single command using the runners shell
       - name: Run a one-line script
         run: echo Hello, world!
+        
+      - name: Setu up OCaml
+        uses: ocaml/setup-ocaml@v1.1.11
 
       # Runs a set of commands using the runners shell
       - name: Run a multi-line script