add setup-sbt action (#499)

Author: xuwei-k

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
           ~/.ivy2/cache
           ~/.cache/coursier
         key: ${{ runner.os }}-sbt-${{ hashFiles('**/*.sbt') }}
+    - uses: sbt/setup-sbt@v1
     - name: Compile and test
       run: |
        sbt +test

.github/workflows/release.yml

@@ -14,6 +14,7 @@ jobs:
             java-version: 8
             distribution: temurin
       - uses: olafurpg/setup-gpg@v3
+      - uses: sbt/setup-sbt@v1
       - name: Publish ${{ github.ref }}
         run: sbt ci-release
         env: