Added arbitrary cache rebuild script

arbitrary-cache-rebuild.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Read API key, removing any trailing newline
+API_KEY=$(cat "${HOME}/qortal/apikey.txt" | tr -d '\n')
+
+# Send the request
+curl -X POST localhost:12391/arbitrary/resources/cache/rebuild -H "X-API-KEY: ${API_KEY}"
+
+# Append argument to file only if provided
+if [ -n "$1" ]; then
+  echo "$1" >> arbitraryCacheComplete.txt
+fi