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/admin/plugin_config.lua

@@ -0,0 +1,66 @@
+--
+-- 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 get_routes = require("apisix.router").http_routes
+local resource = require("apisix.admin.resource")
+local schema_plugin = require("apisix.admin.plugins").check_schema
+local type = type
+local tostring = tostring
+local ipairs = ipairs
+
+
+local function check_conf(id, conf, need_id, schema)
+    local ok, err = core.schema.check(schema, conf)
+    if not ok then
+        return nil, {error_msg = "invalid configuration: " .. err}
+    end
+
+    local ok, err = schema_plugin(conf.plugins)
+    if not ok then
+        return nil, {error_msg = err}
+    end
+
+    return true
+end
+
+
+local function delete_checker(id)
+    local routes, routes_ver = get_routes()
+    if routes_ver and routes then
+        for _, route in ipairs(routes) do
+            if type(route) == "table" and route.value
+               and route.value.plugin_config_id
+               and tostring(route.value.plugin_config_id) == id then
+                return 400, {error_msg = "can not delete this plugin config,"
+                                         .. " route [" .. route.value.id
+                                         .. "] is still using it now"}
+            end
+        end
+    end
+
+    return nil, nil
+end
+
+
+return resource.new({
+    name = "plugin_configs",
+    kind = "plugin config",
+    schema = core.schema.plugin_config,
+    checker = check_conf,
+    unsupported_methods = {"post"},
+    delete_checker = delete_checker
+})