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/t/sse_server_example/go.mod

@@ -0,0 +1,3 @@
+module foo.bar/apache/sse_server_example
+
+go 1.17

CloudronPackages/APISIX/apisix-source/t/sse_server_example/main.go

@@ -0,0 +1,58 @@
+/*
+ * 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.
+ */
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+func sseHandler(w http.ResponseWriter, r *http.Request) {
+	// Set the headers for SSE
+	w.Header().Set("Content-Type", "text/event-stream")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.Header().Set("Connection", "keep-alive")
+
+	f, ok := w.(http.Flusher);
+	if !ok {
+		fmt.Fprintf(w, "[ERROR]")
+		return
+	}
+	// A simple loop that sends a message every 500ms
+	for i := 0; i < 5; i++ {
+		// Create a message to send to the client
+		fmt.Fprintf(w, "data: %s\n\n", time.Now().Format(time.RFC3339))
+
+		// Flush the data immediately to the client
+		f.Flush()
+		time.Sleep(500 * time.Millisecond)
+	}
+	fmt.Fprintf(w, "data: %s\n\n", "[DONE]")
+}
+
+func main() {
+	// Create a simple route
+	http.HandleFunc("/v1/chat/completions", sseHandler)
+	port := os.Args[1]
+	// Start the server
+	log.Println("Starting server on :", port)
+	log.Fatal(http.ListenAndServe(":" + port, nil))
+}