some changes for docker setup (#9)

* added SIGTERM handler for graceful docker shutdown

* added error message

* added example for bitcoind running on the host undockered

* added docker-compose and extended example

* added docker-compose section to README

* addes some note for rpcallowip

* added restart policy

* added DB folder for persistent data

* added $NETWORK as prefix for database path to not get in conflict with testnet setup

* used env variables for stratum and api ports

src/main.ts

@@ -43,6 +43,11 @@ async function bootstrap() {
     process.exit(0);
   });
 
+  process.on('SIGTERM', () => {
+    console.log(`Stopping services`);
+    process.exit(0);
+  });
+
   app.enableCors();
   useContainer(app.select(AppModule), { fallbackOnErrors: true });