Add GCP deployment examples: create Terraform configurations for GCP, including network setup, instance definitions, and routing, along with a README for usage instructions.

examples/gcp/workload.tf

@@ -0,0 +1,25 @@
+# Bare VM on the workload subnet, for manually verifying that its traffic to
+# remote_cidrs flows through the router. Off by default so a plain apply
+# stays to just the router.
+
+resource "google_compute_instance" "workload" {
+  count        = var.deploy_workload_vm ? 1 : 0
+  name         = "${var.name}-workload"
+  machine_type = var.machine_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "ubuntu-os-cloud/ubuntu-2404-lts-amd64"
+    }
+  }
+
+  network_interface {
+    network    = google_compute_network.internal.id
+    subnetwork = google_compute_subnetwork.workload.id
+  }
+
+  metadata = {
+    ssh-keys = "${var.admin_username}:${var.admin_ssh_public_key}"
+  }
+}