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/plugin_config.lua

@@ -0,0 +1,88 @@
+--
+-- 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 plugin_checker = require("apisix.plugin").plugin_checker
+local pairs = pairs
+local error = error
+
+
+local plugin_configs
+
+
+local _M = {
+}
+
+
+function _M.init_worker()
+    local err
+    plugin_configs, err = core.config.new("/plugin_configs", {
+        automatic = true,
+        item_schema = core.schema.plugin_config,
+        checker = plugin_checker,
+    })
+    if not plugin_configs then
+        error("failed to sync /plugin_configs: " .. err)
+    end
+end
+
+
+function _M.plugin_configs()
+    if not plugin_configs then
+        return nil, nil
+    end
+    return plugin_configs.values, plugin_configs.conf_version
+end
+
+
+function _M.get(id)
+    return plugin_configs:get(id)
+end
+
+
+function _M.merge(route_conf, plugin_config)
+    if route_conf.prev_plugin_config_ver == plugin_config.modifiedIndex then
+        return route_conf
+    end
+
+    if not route_conf.value.plugins then
+        route_conf.value.plugins = {}
+    end
+
+    if route_conf.orig_plugins then
+        -- recover
+        route_conf.value.plugins = route_conf.orig_plugins
+    else
+        -- backup in the first time
+        route_conf.orig_plugins = route_conf.value.plugins
+    end
+
+    route_conf.value.plugins = core.table.clone(route_conf.value.plugins)
+
+    for name, value in pairs(plugin_config.value.plugins) do
+        if not route_conf.value.plugins[name] then
+            route_conf.value.plugins[name] = value
+        end
+    end
+
+    route_conf.modifiedIndex = route_conf.orig_modifiedIndex .. "#" .. plugin_config.modifiedIndex
+    route_conf.prev_plugin_config_ver = plugin_config.modifiedIndex
+
+    return route_conf
+end
+
+
+return _M