Added Urbit env var replacement

rpc/mainnet-start.sh

@@ -13,5 +13,13 @@ export ELECTRUM_IP=$ELECTRUM_IP
 export ELECTRUM_PORT=$ELECTRUM_PORT
 export BITCOIN_RPC_AUTH=$BITCOIN_RPC_AUTH
 export BITCOIN_RPC_PASS=$BITCOIN_RPC_PASS
+export APP_URBIT_IP=$APP_URBIT_IP
+
+if [ -z "${APP_URBIT_IP}"  ]
+then
+    cp index.html /index/index.html
+    sed -i "s/local.ip.address.here/${APP_URBIT_IP}/g" /index/index.html
+fi
+
 nginx -c /etc/nginx/conf.d/nginx.conf
 node src/server.js >> /proc/1/fd/1

rpc/server.js

@@ -11,6 +11,7 @@ const btcPassword = process.env.BITCOIN_RPC_PASS;
 const btcRpcUrl = `${btcIp}:${btcRpcPort}/`;
 const electrsHost = process.env.ELECTRUM_IP;
 const electrsPort = process.env.ELECTRUM_PORT;
+const urbitIp = process.env.APP_URBIT_IP;
 const btcRpcAuth = `umbrel:${btcPassword}`;
 // console.log(`INFO PROXY: btc rpc pass: ${btcCookiePass}`)
 console.log(`Bitcoin IP: ${btcIp}`);
@@ -19,6 +20,7 @@ console.log(`Bitcoin URL: ${btcRpcUrl}`);
 console.log(`Electrs IP: ${electrsHost}`);
 console.log(`Electrs port: ${electrsPort}`);
 console.log(`Bitcoin RPC auth: ${btcRpcAuth}`);
+console.log(`Urbit IP: ${urbitIp}`);
 console.log(`INFO PROXY: Electrs host: ${electrsHost}:${electrsPort}`);
 
 const network =