feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/APISIX/apisix-source/t/lib/mock_layer4.lua

@@ -0,0 +1,78 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to You under the Apache License, Version 2.0
+-- (the "License"); you may not use this file except in compliance with
+-- the License.  You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+local core = require("apisix.core")
+local json_decode = require("toolkit.json").decode
+local json_encode = require("toolkit.json").encode
+local ngx = ngx
+local socket = ngx.req.socket
+
+local _M = {}
+
+function _M.dogstatsd()
+    local sock, err = socket()
+    if not sock then
+        core.log.error("failed to get the request socket: ", err)
+        return
+     end
+
+    while true do
+        local data, err = sock:receive()
+
+        if not data then
+            if err and err ~= "no more data" then
+                core.log.error("socket error, returning: ", err)
+            end
+            return
+        end
+        core.log.warn("message received: ", data)
+    end
+end
+
+
+function _M.loggly()
+    local sock, err = socket()
+    if not sock then
+        core.log.error("failed to get the request socket: ", err)
+        return
+     end
+
+    while true do
+        local data, err = sock:receive()
+
+        if not data then
+            if err and err ~= "no more data" then
+                core.log.error("socket error, returning: ", err)
+            end
+            return
+        end
+        local m, err = ngx.re.match(data, "(^[ -~]*] )([ -~]*)")
+        if not m then
+            core.log.error("unknown data received, failed to extract: ", err)
+            return
+        end
+        if #m ~= 2 then
+            core.log.error("failed to match two (header, log body) subgroups", #m)
+        end
+        -- m[1] contains syslog header header <14>1 .... & m[2] contains actual log body
+        local logbody = json_decode(m[2])
+        -- order keys
+        logbody = json_encode(logbody)
+        core.log.warn("message received: ", m[1] .. logbody)
+    end
+end
+
+return _M