Update plugin index

Author: github-actions[bot]

plugins/index.json

@@ -44,6 +44,11 @@
     "desc": "Erlang/OTP vfox plugin, support for managing multiple Erlang/OTP versions in Windows & Uinx-like system.",
     "homepage": "https://github.com/version-fox/vfox-erlang"
   },
+  {
+    "name": "etcd",
+    "desc": "etcd vfox plugin. Use the vfox to manage multiple etcd server & etcdctl & etcductl versions in Linux/Darwin/Windows. Also can be used to install an etcd with failpoint.",
+    "homepage": "https://github.com/version-fox/vfox-etcd"
+  },
   {
     "name": "flutter",
     "desc": "Flutter plugin, https://flutter.dev",