You can now use Azure Key Vault to securely store and retrieve Azure Storage account access key when mounting it as a local share in App Service. Azure Key Vault has the benefits of storing application secrets centrally and securely with the ability to monitor, administer, and integrate with other Azure services like Azure App Service.
This feature is available for App Service Linux code and container, Windows containers and Windows code.
Please refer to https://learn.microsoft.com/en-us/azure/app-service/configure-connect-to-azure-storage?tabs=key-vault%2Ccli&pivots=container-linux for more details.