Add gitea at git.rubenhensen.nl

Single-pod sqlite install (simplest path for a home git host). HTTPS-only,
no SSH listener for now. Wired into the Hetzner tunnel like the other
rubenhensen.nl services.

First visitor to git.rubenhensen.nl can register; Gitea auto-promotes the
first user to admin.

gitea/ingress.yaml

@@ -0,0 +1,24 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: gitea-ingress
+  annotations:
+    cert-manager.io/cluster-issuer: prod-cluster-issuer
+    nginx.ingress.kubernetes.io/proxy-body-size: "1g"
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: git.rubenhensen.nl
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: gitea
+                port:
+                  number: 3000
+  tls:
+    - secretName: letsencrypt-prod
+      hosts:
+        - git.rubenhensen.nl