feat: Add Github Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '25'
+
+      - name: Set up Gradle (with caching)
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Run tests
+        run: ./gradlew test --no-daemon
+
+      - name: Upload test reports
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-reports
+          path: '**/build/reports/tests/'
+          retention-days: 7