Azure App Configuration: Getting PrimaryKey in a arm template - azure

Question

I have extracted the ARM template belonging to the preview version of Azure App Configuration, and am setting it into our IaC repository - so far so good.
Our next logical step is to include insertion of the AppConfiguration.PrimaryKey into our Key Vault. However I do not know the name of this property, and I can not find any information on the subject online. Also I can not see the AppConfiguration/configurationStores type listed in resources.azure.com (assuming its because its still in public preview).
Does anyone know how to reference the primary key (and possibly the read-only primary key), so i can reference them through a "outputs" variable in my arm template?
Then I can let Az Cli/Az Powershell insert the secret into our Key Vault, and we obtain full automation of our IaC

Answer 1

I was not able to figure this out.
However by using az cli commands in a IaC script (which anyways invokes the arm template residing in a azure blob store) I circumvented the problem:
$connStrings = az appconfig credential list -n $configName| ConvertFrom-Json
$readOnlyConnString = ($connStrings | Where {$_.name -eq "Primary Read Only"}).connectionString
$primaryConnString = ($connStrings | Where {$_.name -eq "Primary"}).connectionString
#then
az keyvault secret set --vault-name $kvName --name $keyNameRO --value $readOnlyConnString
az keyvault secret set --vault-name $kvName --name $keyNamePrimary --value $primaryConnString

Answer 2

For an ARM template I did the following. The listkeys function returns a full list of all the values that have to do with the keys. This was hard to figure out. I hope it helps.
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"configurationStores_instance_name": {
"defaultValue": "ac-instance",
"type": "String"
}
},
"variables": {
"apiVersionVar": "[providers('Microsoft.AppConfiguration', 'configurationStores').apiVersions[0]]",
"resourceId": "[resourceId('Microsoft.AppConfiguration/configurationStores', parameters('configurationStores_instance_name'))]",
},
"resources": [
{
"type": "Microsoft.AppConfiguration/configurationStores",
"apiVersion": "2019-10-01",
"name": "[parameters('configurationStores_instance_name')]",
"location": "northcentralus",
"sku": {
"name": "standard"
},
"properties": {}
}
],
"outputs": {
"AppConfigEndpoint": {
"type": "string",
"value": "[reference(parameters('configurationStores_instance_name')).endpoint]"
},
"AppConfigKeys": {
"type": "Array",
"value": "[listkeys(variables('resourceId'), variables('apiVersionVar')).value]"
}
}
}
hope this helps!