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/apisix/plugins/client-control.lua

@@ -0,0 +1,76 @@
+--
+-- 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 require = require
+local core = require("apisix.core")
+local ok, apisix_ngx_client = pcall(require, "resty.apisix.client")
+local tonumber = tonumber
+
+
+local schema = {
+    type = "object",
+    properties = {
+        max_body_size = {
+            type = "integer",
+            minimum = 0,
+            description = "Maximum message body size in bytes. No restriction when set to 0."
+        },
+    },
+}
+
+
+local plugin_name = "client-control"
+
+
+local _M = {
+    version = 0.1,
+    priority = 22000,
+    name = plugin_name,
+    schema = schema,
+}
+
+
+function _M.check_schema(conf)
+    return core.schema.check(schema, conf)
+end
+
+
+function _M.rewrite(conf, ctx)
+    if not ok then
+        core.log.error("need to build APISIX-Runtime to support client control")
+        return 501
+    end
+
+    if conf.max_body_size then
+        local len = tonumber(core.request.header(ctx, "Content-Length"))
+        if len then
+            -- if length is given in the header, check it immediately
+            if conf.max_body_size ~= 0 and len > conf.max_body_size then
+                return 413
+            end
+        end
+
+        -- then check it when reading the body
+        local ok, err = apisix_ngx_client.set_client_max_body_size(conf.max_body_size)
+        if not ok then
+            core.log.error("failed to set client max body size: ", err)
+            return 503
+        end
+    end
+end
+
+
+return _M