ci: Install npm dependencies

.github/workflows/dev.yml

@@ -7,6 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: npm i
       - name: Run the TypeScript build
         run: npx tsc
       - name: Create server-package.json