feat: move kubernetes dir into templates to support jinja2 across all files (#831)

template/templates/kubernetes/apps/flux-system/addons/webhooks/github/ingress.yaml.j2

@@ -0,0 +1,25 @@
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: flux-webhook
+  namespace: flux-system
+  annotations:
+    external-dns.alpha.kubernetes.io/target: "ingress.${SECRET_DOMAIN}"
+    hajimari.io/enable: "false"
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: &host "flux-webhook.${SECRET_DOMAIN}"
+      http:
+        paths:
+          - path: /hook/
+            pathType: Prefix
+            backend:
+              service:
+                name: webhook-receiver
+                port:
+                  number: 80
+  tls:
+    - hosts:
+        - *host