Add add_on

[benoitblais-hashicorp]

Overview/Summary

Add add_on to provision HCP Terraform workspace.

This PR fixes/adds/changes/removes

• Add: add_on to provision HCP Terraform workspace.

Checklist before requesting a review

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

Terraform Format Succeeded

The following files have been formatted, make sure to perform a 'git pull' to update your local repository.

main.tf

main.tf
--- old/main.tf
+++ new/main.tf
@@ -21,7 +21,7 @@
   variable_options = var.template_variables
 
   lifecycle {
-    ignore_changes = [ readme_markdown_template ]
+    ignore_changes = [readme_markdown_template]
   }
 }
 

[github-actions]

Terraform file(s) has been formatted and pushed to the repository.
You need to update your local copy of the repository.