ci: add basic GitHub Actions pipeline

.github/workflows/maven-test.yml

@@ -0,0 +1,26 @@
+name: Build & Test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: "17"
+          distribution: "temurin"
+          cache: maven
+
+      - name: Run tests
+        run: mvn --batch-mode --update-snapshots test jacoco:report
+
+      - uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}