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/ci/linux-install-etcd-client.sh

@@ -0,0 +1,31 @@
+#!/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.
+#
+
+ETCD_ARCH="amd64"
+ETCD_VERSION=${ETCD_VERSION:-'3.5.4'}
+ARCH=${ARCH:-`(uname -m | tr '[:upper:]' '[:lower:]')`}
+
+if [[ $ARCH == "arm64" ]] || [[ $ARCH == "aarch64" ]]; then
+    ETCD_ARCH="arm64"
+fi
+
+wget -q https://github.com/etcd-io/etcd/releases/download/v${ETCD_VERSION}/etcd-v${ETCD_VERSION}-linux-${ETCD_ARCH}.tar.gz
+tar xf etcd-v${ETCD_VERSION}-linux-${ETCD_ARCH}.tar.gz
+sudo cp etcd-v${ETCD_VERSION}-linux-${ETCD_ARCH}/etcdctl /usr/local/bin/
+rm -rf etcd-v${ETCD_VERSION}-linux-${ETCD_ARCH}