Automated documentation update (#475)

Automated documentation update [skip ci]
Co-authored-by: github-actions <github-actions@github.com>

src/terraform/README.md

@@ -21,6 +21,7 @@ Installs the Terraform CLI and optionally TFLint and Terragrunt. Auto-detects la
 | installSentinel | Install sentinel, a language and framework for policy built to be embedded in existing software to enable fine-grained, logic-based policy decisions | boolean | false |
 | installTFsec | Install tfsec, a tool to spot potential misconfigurations for your terraform code | boolean | false |
 | installTerraformDocs | Install terraform-docs, a utility to generate documentation from Terraform modules | boolean | false |
+| httpProxy | Connect to a keyserver using a proxy by configuring this option | string | - |