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/scripts/list_gloud_infra.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+. .env
+
+if [ -z "$PROJECT_NAME" ]; then
+    echo "❌ PROJECT_NAME is not set. Please add PROJECT_NAME=<your_project_name> to your .env file before running this script."
+    exit 1
+fi
+
+gcloud compute instances list --project="$PROJECT_NAME" && gcloud compute disks list --project="$PROJECT_NAME" && gcloud compute firewall-rules list --project="$PROJECT_NAME" && gcloud storage buckets list --project="$PROJECT_NAME"
+
+if [ $? -ne 0 ]; then
+    echo "❌ gcloud is not authenticated, please run 'gcloud auth login' first"
+    echo
+    exit 1
+fi