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/remote_state.tf

@@ -0,0 +1,37 @@
+// Remote state
+// ----------------------------------
+# variable "bucket_name" {
+#   type        = string
+#   default     = "your-project-name-k3s-bucket"
+#   description = "your-project-name k3s Bucket"
+# }
+
+# terraform {
+#   # Use a shared bucket (wich allows collaborative work)
+#   backend "gcs" {
+#     bucket      = "<my-bucket-for-states>"
+#     prefix      = "k3s-infra"
+#   }
+
+#   // Set versions
+#   required_version = ">=1.8.0"
+#   required_providers {
+#     google = {
+#       source  = "hashicorp/google"
+#       version = ">=4.0.0"
+#     }
+#   }
+# }
+
+// The bucket where you can store other data
+# resource "google_storage_bucket" "k3s-storage" {
+#   name     = var.bucket_name
+#   location = var.region
+
+#   labels = {
+#     env       = var.env
+#     region    = var.region
+#     app       = var.app_name
+#     sensitive = "false"
+#   }
+# }