Add setup for sbt

Author: ojarjur

.github/workflows/build.yml

@@ -26,6 +26,7 @@ jobs:
         with:
           clean: true
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+      - uses: sbt/setup-sbt@v1
       - name: Display dependency info
         run: |
           python --version