fix: install backend dependencies in correct directory

Author: srija-pixel

.github/workflows/backend.yml

@@ -18,8 +18,9 @@ jobs:
         with:
           node-version: 20
 
-      - name: Install dependencies
+      - name: Install backend dependencies
         run: npm install
+        working-directory: backend
 
       - name: Start backend briefly
         run: |