Setup sbt and scala before building

Author: noelwelsh

.github/workflows/publish.yml

@@ -66,6 +66,9 @@ jobs:
           sudo apt-get update -y
           sudo apt-get install -y ttf-bitstream-vera
 
+      - name: Install Scala and SBT
+        uses: olafurpg/setup-scala@v11
+
       - name: Generate book
         run: sbt all