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There are times where we have secret values to configure in our cloud resources for our system to work properly. For example, we might need to add an Api Key to a deployed application that communicates with a third party Api, or we have to connect to a SQL Server that only supports traditional user and password authentication. In this blog post we are going to explain how to pass secret values to an Infrastructure as Code pipeline in a secure way using Github Actions and Terraform.

Terraform is an open source CLI tool created by Hashicorp to simplify the task of creating and managing the underlying infrastructure of applications. The idea behind it is to write the desired state of our infrastructure with code in plain-text files. The tool reads these files and updates the real infrastructure on our cloud providers to match what is stated in the files. This way of working makes managing the infrastructure of our projects very efficient.