feat: implement proxy-clear-config

This will allow us to kill stale proxy configuration within apps, which is critical during application renames.

- redirect rmdir output to dev-null
- trigger a proxy-clear-config (new trigger) when renaming an application
  - The configuration will be rebuilt during the later `ps_rebuild`

Closes #3231

plugins/nginx-vhosts/internal-functions

@@ -26,3 +26,9 @@ nginx_vhosts_help_cmd() {
 help_desc
   fi
 }
+
+nginx_clear_config() {
+  declare desc="Remove the nginx conf file"
+  declare APP="$1";
+  rm -f "$DOKKU_ROOT/$APP/nginx.conf"
+}

plugins/nginx-vhosts/proxy-clear-config

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/nginx-vhosts/internal-functions"
+source "$PLUGIN_AVAILABLE_PATH/proxy/functions"
+
+trigger-nginx-vhosts-clear-config() {
+  declare desc="clear nginx config for proxy app containers from command line"
+  declare trigger="trigger-nginx-vhosts-clear-config"
+  declare APP="$1"
+  [[ -z "$APP" ]] && dokku_log_fail "Please specify an app to run the command on"
+
+  if [[ "$(get_app_proxy_type "$APP")" = "nginx" ]]; then
+    plugn trigger network-clear-config "$APP"
+    nginx_clear_config "$APP"
+  fi
+}
+
+trigger-nginx-vhosts-clear-config "$@"