terraform-provider-azurerm: Cannot make Docker Compose based App Services with new App Service resources

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Terraform Version

1.1.7

AzureRM Provider Version

3.0.2

Affected Resource(s)/Data Source(s)

azurerm_[linux|windows]_web_app

Terraform Configuration Files

resource "azurerm_linux_web_app" "as" {
  name = "example"
  resource_group_name = "rg-example"
  location = "westus2"
  service_plan_id = azurerm_service_plan.example.id

  site_config {
    application_stack {
      docker_image = "COMPOSE|${filebase64("example.docker-compose.yml")}"
      docker_image_tag = "?"
    }   
  }
}

Debug Output/Panic Output

n/a

Expected Behaviour

Should be able to create a multi-container linux web application based on the provided Docker Compose file

Actual Behaviour

Tries to convert to an invalid linux_fx_version, which spits out the following:

│ Error: creating Linux Web App: (Site Name "as" / Resource Group "rg-example"): web.AppsClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="The parameter LinuxFxVersion has an invalid value." Details=[{"Message":"The parameter LinuxFxVersion has an invalid value."},{"Code":"BadRequest"},{"ErrorEntity":{"Code":"BadRequest","ExtendedCode":"01007","Message":"The parameter LinuxFxVersion has an invalid value.","MessageTemplate":"The parameter {0} has an invalid value.","Parameters":["LinuxFxVersion"]}}]
│ 
│   with azurerm_linux_web_app.as
│   on sonarqube.tf line 19, in resource "azurerm_linux_web_app" "as":
│   19: resource "azurerm_linux_web_app" "as" {
│ 
│ creating Linux Web App: (Site Name "as" / Resource Group
│ "rg-dexample"): web.AppsClient#CreateOrUpdate: Failure sending
│ request: StatusCode=400 -- Original Error: Code="BadRequest" Message="The
│ parameter LinuxFxVersion has an invalid value." Details=[{"Message":"The
│ parameter LinuxFxVersion has an invalid
│ value."},{"Code":"BadRequest"},{"ErrorEntity":{"Code":"BadRequest","ExtendedCode":"01007","Message":"The
│ parameter LinuxFxVersion has an invalid value.","MessageTemplate":"The
│ parameter {0} has an invalid value.","Parameters":["LinuxFxVersion"]}}]

Steps to Reproduce

No response

Important Factoids

n/a

References

I’m not sure if migrating from azurerm provider from v2 to v3 removed the ability to create multi-container applications, but the previous example of creating these resources don’t seem to work anymore

https://github.com/hashicorp/terraform-provider-azurerm/blob/main/examples/app-service/docker-compose/main.tf

In v3 when using [linux|window]_web_app, we provide specific docker_image and docker_image_tag values, which are converted into the linux_fx_version field. However there is no COMPOSE option to match against: see here and here.

EDIT: line numbers in second link have changed, here’s the code in question:

			if winAppStack.DockerContainerName != "" {
				if winAppStack.DockerContainerRegistry != "" {
					expanded.WindowsFxVersion = utils.String(fmt.Sprintf("DOCKER|%s/%s:%s", winAppStack.DockerContainerRegistry, winAppStack.DockerContainerName, winAppStack.DockerContainerTag))
				} else {
					expanded.WindowsFxVersion = utils.String(fmt.Sprintf("DOCKER|%s:%s", winAppStack.DockerContainerName, winAppStack.DockerContainerTag))
				}
			}

and

			if linuxAppStack.DockerImage != "" {
				expanded.LinuxFxVersion = utils.String(fmt.Sprintf("DOCKER|%s:%s", linuxAppStack.DockerImage, linuxAppStack.DockerImageTag))
			}

The tutorial provided by Azure here doesn’t even list referencing a Container Registry… https://docs.microsoft.com/en-us/azure/app-service/quickstart-multi-container