Sets placeholder secrets on an AzureKeyvault. set the keyVaultName, subscriptionId and placeholders before use.

SetKeyvaultPlaceholderSecrets.ps1

$keyVaultName = "IntegrationSecrets"
$subscriptionId = "xxx"
$placeholders = @(
        'secret1'
        'secret2'
        'secret3'
        'secret4'
    )
az login
az account set --subscription $subscriptionId
$placeholders.foreach({ 
    az keyvault secret set --vault-name $keyVaultName --name $PSItem --value "placeholderValue"
})