Add scala steward

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
   ci:
     # run on external PRs, but not on internal PRs since those will be run by push to branch
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
     - name: Checkout
       uses: actions/checkout@v3
@@ -37,7 +37,7 @@ jobs:
     name: Publish release
     needs: [ci]
     if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v'))
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3

.github/workflows/scala-steward.yml

@@ -15,8 +15,8 @@ jobs:
       - name: Set up JDK 11
         uses: actions/setup-java@v3
         with:
-          distribution: 'temurin'
-          java-version: 11
+          distribution: 'zulu'
+          java-version: '21'
           cache: 'sbt'
       - name: Launch Scala Steward
         uses: scala-steward-org/scala-steward-action@v2

.scala-steward.conf

@@ -1 +1 @@
-[]
+updates.ignore = []