added first websocket implementation, actions and improved tests

.github/workflows/backend.yml

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+on:
+  push:
+    branches:
+      - main
+      - glydric
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  jest-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        working-directory: "Backend"
+        run: npm ci
+      - name: Run tests
+        working-directory: "Backend"
+        run: npm test
+        env:
+          MONGO_PROTOCOL: ${{ secrets.MONGO_PROTOCOL }}
+          MONGO_HOST: ${{ secrets.MONGO_HOST }}
+          MONGO_INITDB_ROOT_USERNAME: ${{ secrets.MONGO_INITDB_ROOT_USERNAME }}
+          MONGO_INITDB_ROOT_PASSWORD: ${{ secrets.MONGO_INITDB_ROOT_PASSWORD }}
+          JWT_SECRET: ${{ secrets.JWT_SECRET }}
+          CSD_USER: ${{ secrets.CSD_USER }}
+          CSD_PASSWORD: ${{ secrets.CSD_PASSWORD }}
+          TELEGRAM_TOKEN: ${{ secrets.TELEGRAM_TOKEN }}

Backend/.eslintrc.json

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+{
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "tsconfig.json",
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint/eslint-plugin"
+  ],
+  "extends": [
+    "plugin:@typescript-eslint/recommended",
+    "plugin:prettier/recommended"
+  ],
+  "root": true,
+  "env": {
+    "node": true,
+    "jest": true
+  },
+  "ignorePatterns": [
+    ".eslintrc.js"
+  ],
+  "rules": {
+    "@typescript-eslint/interface-name-prefix": "off",
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-explicit-any": "off"
+  }
+}

Backend/.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

Backend/jest.config.json

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+{
+  "globalSetup": "./envCheck.ts",
+  "moduleFileExtensions": [
+    "js",
+    "json",
+    "ts"
+  ],
+  "rootDir": "src",
+  "testRegex": ".*\\.spec\\.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  },
+  "collectCoverageFrom": [
+    "**/*.(t|j)s"
+  ],
+  "coverageDirectory": "../coverage",
+  "testEnvironment": "node"
+}