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/k3s/forgejo/ingress.yaml.template

@@ -0,0 +1,24 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: tls-forgejo-ingress-http
+  namespace: forgejo
+  annotations:
+    cert-manager.io/issuer: "le-cluster-issuer-http"
+    
+spec:
+  tls:
+    - hosts:
+        - ${APP_DOMAIN_NAME}
+      secretName: tls-frg-ingress-http
+  rules:
+    - host: ${APP_DOMAIN_NAME}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: forgejo-app-service
+                port:
+                  name: web