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/stream/plugins/limit-conn.lua

@@ -0,0 +1,61 @@
+--
+-- 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 limit_conn = require("apisix.plugins.limit-conn.init")
+
+
+local plugin_name = "limit-conn"
+local schema = {
+    type = "object",
+    properties = {
+        conn = {type = "integer", exclusiveMinimum = 0},
+        burst = {type = "integer",  minimum = 0},
+        default_conn_delay = {type = "number", exclusiveMinimum = 0},
+        only_use_default_delay = {type = "boolean", default = false},
+        key = {type = "string"},
+        key_type = {type = "string",
+            enum = {"var", "var_combination"},
+            default = "var",
+        },
+    },
+    required = {"conn", "burst", "default_conn_delay", "key"}
+}
+
+local _M = {
+    version = 0.1,
+    priority = 1003,
+    name = plugin_name,
+    schema = schema,
+}
+
+
+function _M.check_schema(conf)
+    return core.schema.check(schema, conf)
+end
+
+
+function _M.preread(conf, ctx)
+    return limit_conn.increase(conf, ctx)
+end
+
+
+function _M.log(conf, ctx)
+    return limit_conn.decrease(conf, ctx)
+end
+
+
+return _M