ci(add-lint-typescript): Add CI workflow

Author: barshathakuri

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Python check
+name: CI check
 
 on:
   pull_request:
@@ -86,3 +86,30 @@ jobs:
               git --no-pager diff
               exit 1
             fi
+
+jobs:
+  lint-and-typecheck:
+    name: Lint & Type Check
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: functions
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: yarn
+          cache-dependency-path: functions/yarn.lock
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Run ESLint
+        run: yarn lint
+
+      - name: Run TypeScript type check
+        run: yarn tsc --noEmit