Add GitHub Actions CI workflow

Author: gabriele.sisinna

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+          cache: gradle
+
+      - name: Make Gradle wrapper executable
+        run: chmod +x gradlew
+
+      - name: Run tests
+        run: ./gradlew test --no-daemon

README.md

@@ -95,6 +95,16 @@ curl -X POST http://localhost:8080/api/students \
 ./gradlew test
 ```
 
+## GitHub CI
+
+This repo includes a GitHub Actions workflow at `.github/workflows/ci.yml`.
+
+It runs on every push and pull request, sets up Java 17, and executes:
+
+```bash
+./gradlew test --no-daemon
+```
+
 ## What to edit first
 
 1. In `Student.java`, change how `level()` works.