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/docker/utils/check_standalone_config.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+#
+# 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.
+#
+
+if ! grep -q 'role: data_plane' "${PREFIX}/conf/config.yaml"; then
+    echo "Error: ${PREFIX}/conf/config.yaml does not contain 'role: data_plane'. Deployment role must be set to 'data_plane' for standalone mode."
+    echo "Please refer to the APISIX documentation for deployment modes: https://apisix.apache.org/docs/apisix/deployment-modes/"
+    exit 1
+fi
+
+if ! grep -q 'role_data_plane:' "${PREFIX}/conf/config.yaml"; then
+    echo "Error: ${PREFIX}/conf/config.yaml does not contain 'role_data_plane:'."
+    echo "Please refer to the APISIX documentation for deployment modes: https://apisix.apache.org/docs/apisix/deployment-modes/"
+    exit 1
+fi
+
+if ! grep -q 'config_provider: yaml' "${PREFIX}/conf/config.yaml"; then
+    echo "Error: ${PREFIX}/conf/config.yaml does not contain 'config_provider: yaml'. Config provider must be set to 'yaml' for standalone mode."
+    echo "Please refer to the APISIX documentation for deployment modes: https://apisix.apache.org/docs/apisix/deployment-modes/"
+    exit 1
+fi