feat: setup python env manually

.github/workflows/cicd.yaml

@@ -37,12 +37,18 @@ jobs:
         uses: actions/setup-python@v5
         with:
           cache: 'pip'
-
+
+      - name: Install dependencies
+        run: |
+          python -m venv venv
+          source venv/bin/activate
+          pip install --upgrade pip
+          pip install flake8
+        
       - name: Run flake8
-        uses: py-actions/flake8@v2
-        with:
-          exclude: "core/alembic/versions/"
-          path: "core"
+        run: |
+          source venv/bin/activate
+          flake8 --exclude=core/alembic/versions/ core
 
   build:
     name: Build docker image