feat(igotify): deploy igotify server + upgrade gotify to 3.1.0

- igotify server v1.6.0.1 (supports Gotify 3.x)
- gotify upgraded 2.9.1 → 3.1.0
- igotify PVC, Deployment, Service, Ingress in notifications ns
- CoreDNS rewrite for igotify.riotpiao.com → nginx

k8s/apps/gotify/igotify-pvc.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: igotify-data
+  namespace: notifications
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi