Allow external HTTP requests to BTCPay

Limited to private network via firewall rule.

site-cookbooks/kosmos-bitcoin/templates/btcpay-settings.config.erb

@@ -1,6 +1,6 @@
 network=<%= @bitcoin_network %>
 port=<%= @btcpay_port %>
-bind=127.0.0.1
+bind=0.0.0.0
 chains=btc
 postgres=User ID=<%= @postgres_user %>;Password=<%= @postgres_password %>;Host=<%= @postgres_host %>;Port=<%= @postgres_port %>;Database=<%= @postgres_database %>;
 debuglog=<%= @btcpay_log_path %>