docker: Add EXPOSE_BITCOIND_RPC option

To make the Bitcoin Core RPC server accessible from outside
the container (needed to assist testing).

Author: shesek

run.sh

@@ -197,6 +197,13 @@ if [ -f /data/private_nodes ]; then
     cat /data/private_nodes >> /data/.${DAEMON}.conf
 fi
 
+if [ -n "$EXPOSE_BITCOIND_RPC" ]; then
+    cat << CONF >> /data/.${DAEMON}.conf
+rpcbind=0.0.0.0
+rpcallowip=0.0.0.0/0
+CONF
+fi
+
 TORRCFILE="/srv/explorer/source/contrib/${DAEMON}-${NETWORK}-${MODE}-torrc"
 if [ -f $TORRCFILE ]; then
     cp $TORRCFILE /etc/tor/torrc