Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

.github/workflows/ci.yml

@@ -254,3 +254,37 @@ jobs:
 
       - name: Publish
         run: sbt '++ ${{ matrix.scala }}' tlCiRelease
+
+  validate-steward:
+    name: Validate Steward Config
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        scala: [2.13.6]
+        java: [temurin@11]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout current branch (fast)
+        uses: actions/checkout@v3
+
+      - name: Download Java (temurin@17)
+        id: download-java-temurin-17
+        if: matrix.java == 'temurin@17'
+        uses: typelevel/download-java@v2
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Setup Java (temurin@17)
+        if: matrix.java == 'temurin@17'
+        uses: actions/setup-java@v3
+        with:
+          distribution: jdkfile
+          java-version: 17
+          jdkFile: ${{ steps.download-java-temurin-17.outputs.jdkFile }}
+
+      - uses: coursier/setup-action@v1
+        with:
+          apps: scala-steward
+
+      - run: scala-steward validate-repo-config .scala-steward.conf