ci: add GitHub Actions CI/CD pipeline

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: Build & Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java-version: [ '11' ]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK ${{ matrix.java-version }}
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Build with Maven
+        run: mvn -B compile --no-transfer-progress
+
+      - name: Run tests
+        run: mvn -B test --no-transfer-progress
+        continue-on-error: true
+
+      - name: Package
+        run: mvn -B package -DskipTests --no-transfer-progress
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-java-${{ matrix.java-version }}
+          path: target/surefire-reports/
+          retention-days: 7