Add GitHub Actions CI workflow for automated testing on PRs

Author: julman99

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ master, main ]
+  push:
+    branches: [ master, main ]
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        java-version: [8, 11, 17, 21]
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK ${{ matrix.java-version }}
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+          cache: maven
+
+      - name: Build and Test
+        run: mvn -B verify --file pom.xml
+
+      - name: Upload Test Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-java-${{ matrix.java-version }}
+          path: target/surefire-reports/
+          retention-days: 7
+