backend tests in ci, clean pg import (#71)

- run backend tests in CI
- clean `pg` import
- fix cyclic dependency
- fix dotenv import

---------

Co-authored-by: Marco Pasqualetti <24919330+marcalexiei@users.noreply.github.com>

.github/workflows/ci.yml

@@ -33,19 +33,22 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Install Dependencies
-        uses: ./.github/actions/install-dependencies
-        with:
-          node-version: ${{ matrix.node }}
-
       - name: Run vercel-preparation.sh
         run: |
           chmod +x ./vercel-preparation.sh
           ./vercel-preparation.sh
 
+      - name: Install Dependencies
+        uses: ./.github/actions/install-dependencies
+        with:
+          node-version: ${{ matrix.node }}
+
       - name: Build frontend
         run: pnpm --filter frontend run build
 
+      - name: Run backend tests
+        run: pnpm --filter github-readme-stats run test
+
   frontend-test-e2e:
     name: Frontend E2E test