fixed ci for lint and test

.gitea/workflows/backend_run_lint.yaml

@@ -15,17 +15,15 @@ jobs:
 
     - uses: https://gitea.com/actions/checkout@v4
 
-    - name: Install dependencies
-      run: |
-        apt-get update && apt-get install -y python3 python3-pip
-        pip install pipenv        
+    - name: Install uv
+      uses: astral-sh/setup-uv@v6
+      with:
+        version: "0.9.11"
 
-    - name: Install packages
-      run: |
-        ls -la
-        # only install dev-packages
-        pipenv install --categories=dev-packages
+    - name: Install dependencies
       working-directory: backend
+      run: |
+        uv sync --frozen --no-cache --no-dev
 
     - name: Run linter
       run: pipenv run pylint src --fail-under=9