Install sbt

Author: mkurz

.github/workflows/scala.yml

@@ -19,5 +19,7 @@ jobs:
         distribution: temurin
         java-version: 8.0.372+7
         cache: sbt
+    - name: Install sbt
+      uses: sbt/setup-sbt@v1
     - name: Run tests
-      run: sbt "^ scripted"
+      run: sbt "^ scripted"