Run the webapp server fails in Dev Containers

[NanaXiong00]

Describe the issue: When executing npm start according to README.md, the error is as follows:

Repro Steps:

1. Start Docker Desktop
2. Open the project: Open in Dev Containers
3. Run azd auth login
4. Run azd up
5. Run npm install --prefix api and npm start --prefix api
6. Run npm install and npm start

Environment:

• Azd version: azd version 1.9.5 (commit cd2b7af9995d358aab33c782614f801ac1997dde)
• OS: VS Code Dev Containers

Expected behavior: Run npm start can successfully.

@jongio and @manekinekko for notification.