ci: add typecheck to CI workflow (#36)

* ci: add typecheck to CI workflow

* ci: move typecheck to separate job for separate check status

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: jamesbhobbs

.github/workflows/ci.yml

@@ -47,6 +47,30 @@ jobs:
       - name: Check Prettier formatting
         run: npm run format
 
+  typecheck:
+    name: TypeCheck
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          cache: 'npm'
+          node-version: ${{ env.NODE_VERSION }}
+          registry-url: 'https://npm.pkg.github.com'
+          scope: '@deepnote'
+
+      - name: Install dependencies
+        run: npm ci --prefer-offline --no-audit
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Run TypeScript type checking
+        run: npm run typecheck
+
   qlty:
     name: Qlty Check
     runs-on: ubuntu-latest