Add a basic CI workflow

.github/workflows/build.yaml

@@ -0,0 +1,35 @@
+name: Build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up JDK
+        uses: actions/setup-java@v5
+        with:
+          java-version: "17"
+          distribution: "temurin"
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Cache Kotlin/Native toolchains
+        uses: actions/cache@v4
+        with:
+          path: ~/.konan
+          key: ${{ runner.os }}-konan-${{ hashFiles('build.gradle.kts') }}
+          restore-keys: |
+            ${{ runner.os }}-konan-
+
+      - name: Build with Gradle
+        run: ./gradlew build --continue