Synapse: Add script to generate registration token

synapse/generate_registration_token.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+rel_path="$(dirname "$0")"
+access_token="$(cat $rel_path/../matrix_access_token.txt)"
+
+curl --header "Authorization: Bearer $access_token" \
+	-H "Content-Type: application/json" -w "\n" \
+	-X POST http://localhost:8008/_synapse/admin/v1/registration_tokens/new \
+	-d '{ "uses_allowed": 1, "expiry_time": '"$(date +%s000 -d tomorrow)"' }'