feat: add nginx template reload script

nginx/reload.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+
+docker compose exec -T nginx /docker-entrypoint.d/20-envsubst-on-templates.sh
+docker compose exec -T nginx nginx -t
+docker compose exec -T nginx nginx -s reload
+
+echo "Nginx configuration reloaded successfully."