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/provider.tf

@@ -0,0 +1,24 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 4.0"
+    }
+  }
+}
+
+// Provider
+// ----------------------------------
+
+// Connect to the GCP project
+provider "google" {
+  # Configuration options
+  project = var.project_name # Use variable from tfvars
+  region  = "us-central1"    # Replace with your desired region
+}
+# provider "google" {
+#   credentials = file("<my-gcp-creds>.json")
+#   project     = var.project_name
+#   region      = var.region
+#   zone        = var.zone
+# }