java 21 in action

Author: tildejustin

.github/workflows/build.yml

@@ -15,6 +15,11 @@ jobs:
         uses: actions/checkout@v4
       - name: validate gradle wrapper
         uses: gradle/actions/wrapper-validation@v4
+      - name: setup java
+        uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: 21
       - name: build
         run: |
           chmod +x ./gradlew