fix(neko) fix neko add missing env variable (#19977)

**Description**
Fix neko chart.
⚒️ Fixes  #19919

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [X] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

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**✔️ Checklist:**

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**➕ App addition**

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charts/stable/neko/questions.yaml

@@ -46,6 +46,12 @@ questions:
       additional_attrs: true
       type: dict
       attrs:
+        - variable: ip
+          label: IP
+          description: IP of the server that will be sent to client, if not specified, public IP is automatically resolved.
+          schema:
+            type: string
+            default: "0.0.0.0"
         - variable: auth
           label: Auth Credentials
           schema:

charts/stable/neko/values.yaml

@@ -64,6 +64,7 @@ service:
         protocol: udp
 
 neko:
+  ip: "0.0.0.0"
   auth:
     user_pass: ""
     admin_pass: ""
@@ -88,6 +89,7 @@ workload:
           env:
             NEKO_BIND: '{{ printf ":%v" .Values.service.main.ports.main.port }}'
             NEKO_PATH_PREFIX: "/"
+            NEKO_NAT1TO1: "{{ .Values.neko.ip }}"
             # NEKO_EPR
             NEKO_TCPMUX: "{{ .Values.service.mux.ports.tcp.port }}"
             NEKO_UDPMUX: "{{ .Values.service.mux.ports.tcp.port }}"