ci: add GitHub Actions workflow

Author: vklimontovich

.claude/CLAUDE.md

@@ -1,3 +1,5 @@
 # Nextlytics
 
 Read `DEVELOPMENT.md` for development commands and setup.
+
+Before commiting code run `bun run verify`

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Typecheck
+        run: bun run typecheck
+
+      - name: Lint
+        run: bun run lint
+
+      - name: Format check
+        run: bun run format:check
+
+      - name: Test
+        run: bun run test