add ENV variable to control crawler execution

index.js

@@ -6,7 +6,11 @@ const bodyParser = require("body-parser");
 const layout = require("express-layout");
 const compression = require("compression");
 
-const { APP_PORT, CRAWLER_INTERVAL } = require("./app/config/appConfig");
+const {
+  APP_PORT,
+  CRAWLER_INTERVAL,
+  STOP_CRAWLER
+} = require("./app/config/appConfig");
 const routes = require("./app/routes");
 const { crawlAll } = require("./app/crawler/crawl");
 
@@ -28,7 +32,7 @@ app.listen(APP_PORT, () =>
   console.log(`Example app listening on port ${APP_PORT}!`)
 );
 
-let crawlerRunning = false;
+let crawlerRunning = STOP_CRAWLER;
 const crawl = () => {
   if (!crawlerRunning) {
     crawlerRunning = true;