use configuration files during runtime

package.json

@@ -26,6 +26,7 @@
     "@nestjs/core": "^9.0.0",
     "@nestjs/mongoose": "^9.2.0",
     "@nestjs/platform-express": "^9.0.0",
+    "js-yaml": "^4.1.0",
     "mongoose": "^6.6.7",
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
@@ -37,6 +38,7 @@
     "@nestjs/testing": "^9.0.0",
     "@types/express": "^4.17.13",
     "@types/jest": "28.1.8",
+    "@types/js-yaml": "^4.0.5",
     "@types/node": "^16.0.0",
     "@types/supertest": "^2.0.11",
     "@typescript-eslint/eslint-plugin": "^5.0.0",