Add script to persist OpenAPI frol localhost

Run this script:
it reads locahost/docs.json, and upate docs/openapi.json if necessary.

docs/persist.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+# Default values
+default_url=https://localhost/docs.json
+default_output_file_path="docs/openapi.json"
+
+url="${1:-$default_url}"
+output_file_path="${2:-$default_output_file_path}"
+
+# Use curl to fetch the JSON data from the provided URL
+json_data=$(curl -s "$url")
+
+# Check if the curl command was successful
+if [ $? -ne 0 ]; then
+  echo "Failed to fetch JSON data from $url"
+  exit 1
+fi
+
+# Write the JSON data to the specified output file
+echo "$json_data" > "$output_file_path"
+
+# Check if the write operation was successful
+if [ $? -ne 0 ]; then
+  echo "Failed to write JSON data to $output_file_path"
+  exit 1
+fi
+
+echo "JSON data successfully copied from $url to $output_file_path"
+
+# how to use it:
+# bash docs/persist.sh "http://example.com.docs.json" "docs/test.json"
+# or with default values: bash docs/persist.sh