Ensure access to Azure SQL Servers is restricted within Azure Infrastructure via Azure SQL Firewall Rule

Allowing unrestricted, public access to cloud services could open an application up to external attack. Disallowing this access is typically considered best practice.

In Azure Console -

1. Open the Azure Portal and go to SQL servers.
2. Choose the SQL server you wish to edit.
3. Under Networking, Set Firewall rules for Public network access.
4. Select Save

In Terraform -

1. In the azurerm_sql_firewall_rule resource, set start_ip_address and end_ip_address.

References:
https://learn.microsoft.com/en-us/azure/azure-sql/database/firewall-configure?view=azuresql
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/sql_firewall_rule