Add CI workflow: build, typecheck, test

Co-authored-by: Ona <no-reply@ona.com>

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+
+      - run: bun install
+
+      - run: bun run build
+
+      - run: bun run typecheck
+
+      - run: bun test