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/pvc.yaml

@@ -0,0 +1,26 @@
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: forgejo-local-pv
+spec:
+  capacity:
+    storage: 3Gi
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: /mnt/disks/app-data/forgejo
+  storageClassName: local-path
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: forgejo-data-pvc
+  namespace: forgejo
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 3Gi
+  volumeName: forgejo-local-pv
+  storageClassName: local-path