The .bicep files are pipeline files for Azure Resources Manager (ARM). Here is a quote from Microsoft's documentation on what a bicep file is:
Bicep is a domain-specific language (DSL) that uses declarative syntax to deploy Azure resources. In a Bicep file, you define the infrastructure you want to deploy to Azure, and then use that file throughout the development lifecycle to repeatedly deploy your infrastructure. Your resources are deployed in a consistent manner.
The .bicep files are pipeline files for Azure Resources Manager (ARM). Here is a quote from Microsoft's documentation on what a bicep file is:
Here is a link to Microsoft's documentation