add can_ip_forward variable

[rojomisin]

This would allow setting can_ip_forward to be accessible in this bastion module instance template.

[comment-bot-dev]

@rojomisin Thanks for the PR! 🚀 Unfortunately it looks like some of our CI checks failed. See the Contributing Guide for details.

• ⚠️check_terraform Failed Terraform check. More details below.

Running terraform fmt
main.tf
--- old/main.tf
+++ new/main.tf
@@ -87,7 +87,7 @@
    subnetwork         = var.subnet
    subnetwork_project = var.host_project != "" ? var.host_project : var.project
    access_config      = var.external_ip ? var.access_config : []
-#    access_config      = var.external_ip != "" ? var.access_config : [{nat_ip : var.external_ip, network_tier : "PREMIUM", public_ptr_domain_name : ""}]
+    #    access_config      = var.external_ip != "" ? var.access_config : [{nat_ip : var.external_ip, network_tier : "PREMIUM", public_ptr_domain_name : ""}]
  }

  source_instance_template = module.instance_template.self_link
Error: terraform fmt failed with exit code 3
Check the output for diffs and correct using terraform fmt <dir>

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