Update builder

.github/workflows/build.yaml

@@ -9,8 +9,12 @@ on:
 
 jobs:
   build:
-    name: Build JAR & Run Tests
+    name: Build JAR & Run Tests (Java ${{ matrix.java }})
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java: [ '11', '17', '21' ]
 
     steps:
       - name: Configure Dynamic DNS Resolvers
@@ -23,21 +27,21 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up Java JDK (Temurin 17)
+      - name: Set up Java JDK (Temurin ${{ matrix.java }})
         uses: actions/setup-java@v3
         continue-on-error: true
         with:
-          java-version: '17'
+          java-version: ${{ matrix.java }}
           distribution: 'temurin'
 
       - name: Ensure Java Available
         run: |
           if ! command -v javac >/dev/null 2>&1; then
-            echo "Installing OpenJDK 17 via package manager..."
+            echo "Installing OpenJDK ${{ matrix.java }} via package manager..."
             if command -v apt-get >/dev/null 2>&1; then
-              apt-get update && apt-get install -y openjdk-17-jdk-headless || true
+              apt-get update && apt-get install -y openjdk-${{ matrix.java }}-jdk-headless || true
             elif command -v apk >/dev/null 2>&1; then
-              apk add --no-cache openjdk17 || true
+              apk add --no-cache openjdk${{ matrix.java }} || true
             fi
           fi
           echo "Java compiler:"
@@ -53,23 +57,27 @@ jobs:
         run: |
           sh ./test_all.sh
 
+      - name: Prepare Versioned JAR
+        run: |
+          cp build/j3270.jar "build/j3270-java${{ matrix.java }}.jar"
+
       - name: Upload j3270 Executable JAR Artifact
         uses: actions/upload-artifact@v3
         continue-on-error: true
         with:
-          name: j3270-executable-jar
-          path: build/j3270.jar
+          name: j3270-java${{ matrix.java }}-jar
+          path: build/j3270-java${{ matrix.java }}.jar
 
       - name: Upload Test Reports
         if: always()
         uses: actions/upload-artifact@v3
         continue-on-error: true
         with:
-          name: test-reports
+          name: test-reports-java${{ matrix.java }}
           path: build/reports/tests/
 
       - name: Report Build Status
         if: failure()
         run: |
-          echo "### ❌ Build or Test Failed" >> $GITHUB_STEP_SUMMARY
+          echo "### ❌ Build or Test Failed for Java ${{ matrix.java }}" >> $GITHUB_STEP_SUMMARY
           echo "Please check the runner logs above for details." >> $GITHUB_STEP_SUMMARY