Add a default CI

Author: nkcoder

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [ ready_for_review, opened, reopened, synchronize ]
+  push:
+    branches: [ main ]
+# Cancel in-progress runs for the same PR/branch
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.draft == false
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up JDK
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: 25
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+        with:
+          cache-read-only: ${{ github.event_name == 'pull_request' }}
+
+      - name: Build and test
+        run: ./gradlew build --no-daemon

.gitignore

@@ -45,4 +45,5 @@ bin/
 .metals
 .bloop
 
+.claude
 CLAUDE.md