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/docs/en/latest/customize-nginx-configuration.md

@@ -0,0 +1,63 @@
+---
+title: Customize Nginx configuration
+---
+
+<!--
+#
+# 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.
+#
+-->
+
+The Nginx configuration used by APISIX is generated via the template file `apisix/cli/ngx_tpl.lua` and the parameters in `apisix/cli/config.lua` and `conf/config.yaml`.
+
+You can take a look at the generated Nginx configuration in `conf/nginx.conf` after running `./bin/apisix start`.
+
+If you want to customize the Nginx configuration, please read through the `nginx_config` in `conf/config.default.example`. You can override the default value in the `conf/config.yaml`. For instance, you can inject some snippets in the `conf/nginx.conf` via configuring the `xxx_snippet` entries:
+
+```yaml
+...
+# put this in config.yaml:
+nginx_config:
+    main_configuration_snippet: |
+        daemon on;
+    http_configuration_snippet: |
+        server
+        {
+            listen 45651;
+            server_name _;
+            access_log off;
+
+            location /ysec_status {
+                req_status_show;
+                allow 127.0.0.1;
+                deny all;
+            }
+        }
+
+        chunked_transfer_encoding on;
+
+    http_server_configuration_snippet: |
+        set $my "var";
+    http_admin_configuration_snippet: |
+        log_format admin "$request_time $pipe";
+    http_end_configuration_snippet: |
+        server_names_hash_bucket_size 128;
+    stream_configuration_snippet: |
+        tcp_nodelay off;
+...
+```
+
+Pay attention to the indent of `nginx_config` and sub indent of the sub entries, the incorrect indent may cause `./bin/apisix start` to fail to generate Nginx configuration in `conf/nginx.conf`.