从这篇文章：Merge App Settings With Bicep。
1.部署时不要将appSettings包含在siteConfig中。
1.创建一个模块来创建/更新将合并现有设置与新设置的应用程序设置。

• appsettings.bicep* 文件：

param webAppName string
param appSettings object
param currentAppSettings object

resource webApp 'Microsoft.Web/sites@2022-03-01' existing = {
  name: webAppName
}

resource siteconfig 'Microsoft.Web/sites/config@2022-03-01' = {
  parent: webApp
  name: 'appsettings'
  properties: union(currentAppSettings, appSettings)
}

main.bicep:

param webAppName string
...

// Create the webapp without appsettings
resource webApp 'Microsoft.Web/sites@2022-03-01' = {
  name: webAppName
  ...
  properties:{    
    ... 
    siteConfig: {
      // Dont include the appSettings
    }
  }
}

// Create-Update the webapp app settings.
module appSettings 'appsettings.bicep' = {
  name: '${webAppName}-appsettings'
  params: {
    webAppName: webApp.name
    // Get the current appsettings
    currentAppSettings: list(resourceId('Microsoft.Web/sites/config', webApp.name, 'appsettings'), '2022-03-01').properties
    appSettings: {
      Foo: 'Bar'
    }
  }
}