Add Google Cloud K3s infrastructure support

- Add Terraform configuration for GCP instance and storage
- Add startup script for K3s installation and configuration
- Add pipeline scripts for deployment and management
- Add Forgejo deployment manifests and configuration

gcloud/tf/main.tf

@@ -0,0 +1,95 @@
+
+
+// Compute
+// ----------------------------------
+
+// The instance for K3S
+resource "google_compute_instance" "k3s" {
+  name         = "k3s-vm-1"
+  machine_type = "e2-small" # This instance will have 2 Gb of RAM
+  zone         = var.zone
+
+  tags = ["web"]
+
+  // Set the boot disk and the image (10 Gb)
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-12"
+      size  = 10
+    }
+  }
+
+  // ensures that the instance is a Spot VM
+  // means it can be preempted, but it's cheaper
+  # scheduling {
+  #   automatic_restart  = false
+  #   provisioning_model = "SPOT"
+  #   preemptible        = true
+  # }
+
+  // attach a disk for K3S
+  attached_disk {
+    source      = google_compute_disk.k3s_disk.id
+    device_name = "k3s-disk"
+  }
+
+  // attach a disk for app data
+  attached_disk {
+    source      = google_compute_disk.app_data_disk.id
+    device_name = "app-data-disk"
+  }
+
+  network_interface {
+    network = "default"
+
+    // enable ephemeral ip
+    access_config {}
+  }
+
+  labels = {
+    env       = var.env
+    region    = var.region
+    app       = var.app_name
+    sensitive = "false"
+  }
+
+  metadata_startup_script   = file("scripts/k3s-vm-startup.sh")
+  allow_stopping_for_update = true
+}
+
+
+// Storage
+// ----------------------------------
+
+// The disk attached to the instance (15 Gb)
+resource "google_compute_disk" "k3s_disk" {
+  name = "k3s-disk"
+  size = 15
+  type = "pd-standard"
+  zone = var.zone
+}
+
+// The disk for app data (20 Gb)
+resource "google_compute_disk" "app_data_disk" {
+  name = "app-data-disk"
+  size = 20
+  type = "pd-standard"
+  zone = var.zone
+}
+
+// Outputs
+// ----------------------------------
+
+data "google_project" "project" {
+  project_id = var.project_name # Use variable from tfvars
+}
+
+output "project_number" {
+  value = data.google_project.project.number
+}
+
+output "k3s_vm_public_ip" {
+  value       = google_compute_instance.k3s.network_interface[0].access_config[0].nat_ip
+  description = "Ephemeral public IP of the k3s VM"
+}
+