feat: Add GitHub Actions CI workflow

This commit introduces a new GitHub Actions workflow for continuous
integration. The workflow is triggered on push and pull request events.
It sets up the environment, installs dependencies, prepares the build,
and runs tests.

.github/workflows/ci.yaml

@@ -0,0 +1,18 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+      - run: bun i --frozen-lockfile
+      - run: bun run prepare
+      - run: bun run test