workflow improvement

Author: TriDefender

.github/workflows/build.yml

@@ -25,14 +25,22 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up JDK 17
-        uses: actions/setup-java@v4
-        with:
-          java-version: '17'
-          distribution: 'temurin'
+      - name: Ensure JDK 17 is available
+        run: |
+          set -euxo pipefail
+          if java -version 2>&1 | grep -q 'version "17\.'; then
+            java -version
+            exit 0
+          fi
+
+          sudo apt-get update
+          sudo apt-get install -y openjdk-17-jdk
+          echo "JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64" >> "$GITHUB_ENV"
+          echo "/usr/lib/jvm/java-17-openjdk-amd64/bin" >> "$GITHUB_PATH"
+          java -version
 
-      - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v4
+      - name: Make Gradle wrapper executable
+        run: chmod +x ./gradlew
 
       # ── Debug build ──────────────────────────────────────────────────