fix: Continuous integration improvements

backend/package.json

@@ -10,7 +10,7 @@
     "start": "NODE_ENV=PROD node dist/src/index.js",
     "predev": "npx prisma migrate dev --name init && npx prisma generate",
     "dev": "NODE_ENV=DEV nodemon -e ts --exec \"npm run build && node dist/src/index.js\"",
-    "pretest": "npx prisma migrate deploy && npx prisma generate",
+    "pretest": "npx prisma migrate dev --name init && npx prisma generate",
     "test": "NODE_ENV=TEST npm run build && mocha \"dist/test/**/*.test.js\""
   },
   "keywords": [],

backend/src/index.ts

@@ -4,12 +4,9 @@ import algorithmRouter from "./routers/algorithm.router.js";
 import authenticationRouter from "./routers/authentication.router.js";
 import errorHandler from "./middlewares/error.middleware.js";
 import { PORT } from "./config/config.js";
-import { PrismaClient } from "@prisma/client";
 
 export const app: Express = express();
 
-export const prisma = new PrismaClient();
-
 app.use(cors());
 
 app.use(express.json());

backend/src/routers/authentication.router.ts

@@ -1,5 +1,5 @@
 import { Router } from "express";
-import { prisma } from "../index.js";
+import { PrismaClient } from "@prisma/client";
 import UserRepository from "../repositories/user.repository.js";
 import AuthenticationService from "../services/authentication.service.js";
 import AuthenticationController from "../controllers/authentication.controller.js";
@@ -11,6 +11,8 @@ import {
 
 const authenticationRouter = Router();
 
+const prisma = new PrismaClient();
+
 const userRepository: UserRepositoryInterface = new UserRepository(prisma);
 
 const authenticationService: AuthenticationServiceInterface =