ci: add yml to build and run tests

Author: buongarzoni

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI (Build & Test)
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "**"   # or restrict to `main` if you prefer
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Cache Gradle
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: gradle-
+
+      - name: Run tests
+        run: ./gradlew test --stacktrace