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/build-gcloud-k3s-pipeline.json

@@ -0,0 +1,29 @@
+[
+    {
+        "name": "run pre-flight checks",
+        "function": "RunCommand",
+        "params": [
+            "./gcloud/tf/scripts/pre-flight-checks.sh"
+        ],
+        "retryCount": 0,
+        "shouldAbort": true
+    },
+    {
+        "name": "list gcloud infrastructure",
+        "function": "RunCommand",
+        "params": [
+            "./gcloud/tf/scripts/list_gloud_infra.sh"
+        ],
+        "retryCount": 0,
+        "shouldAbort": true
+    },
+    {
+        "name": "run tofu",
+        "function": "RunCommand",
+        "params": [
+            "./gcloud/tf/scripts/run_tofu.sh"
+        ],
+        "retryCount": 0,
+        "shouldAbort": true
+    }
+]