changed docker file nest to avoid rebuild everything each time, and small changes in chat gateway

tests_hugo/with_express/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "tests_hugo",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "dependencies": {
+    "express": "^4.18.2"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}