add scala steward job and add license headers

.github/workflows/build-test.yml

@@ -1,3 +1,11 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# license agreements; and to You under the Apache License, version 2.0:
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# This file is part of the Apache Pekko project, which was derived from Akka.
+#
+
 name: Build and test
 
 on:
@@ -6,7 +14,7 @@ on:
 jobs:
   build-test:
     name: Build and test all samples
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/format.yml

@@ -1,3 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
 name: Scalafmt
 
 permissions: {}

.github/workflows/publish-nightly.yml

@@ -1,3 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
 name: Publish Nightly
 
 on:
@@ -11,7 +28,7 @@ permissions:
 jobs:
   publish-nightly:
     name: Publish docs nightly
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     if: github.repository == 'apache/pekko-samples'
     steps:
       - name: Checkout

.github/workflows/scala-steward.yml

@@ -0,0 +1,45 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 0'
+
+name: Launch Scala Steward
+
+# The GitHub Action doesn't need permissions: it only reads already-public
+# data and creates PRs through the scala-steward-asf bot:
+permissions: {}
+
+jobs:
+  scala-steward:
+    runs-on: ubuntu-latest
+    name: Launch Scala Steward
+    if: github.repository == 'apache/pekko-samples'
+    steps:
+      - name: Install sbt
+        uses: sbt/setup-sbt@v1
+      - name: Launch Scala Steward
+        uses: scala-steward-org/scala-steward-action@v2
+        env:
+          JAVA_OPTS: "-XX:+UseG1GC -Xms4G -Xmx4G -Xss2M -XX:+AlwaysActAsServerClassMachine -XX:ReservedCodeCacheSize=256m -XX:MaxGCPauseMillis=750 -XX:+UseCompressedOops -XX:MetaspaceSize=512M"
+        with:
+          github-app-id: ${{ secrets.SCALA_STEWARD_APP_ID }}
+          github-app-installation-id: ${{ secrets.SCALA_STEWARD_INSTALLATION_ID }}
+          github-app-key: ${{ secrets.SCALA_STEWARD_PRIVATE_KEY }}
+          github-app-auth-only: true