fix: Add virtual environment creation to CI workflow

- Added  step to the CI workflow to create a virtual environment
  before installing dependencies, resolving the "No virtual environment found" error.

Author: KKamJi98

.github/workflows/build-and-test.yml

@@ -19,6 +19,8 @@ jobs:
           python-version: '3.x'
       - name: Install uv
         run: pip install uv
+      - name: Create virtual environment
+        run: uv venv
       - name: Install dependencies
         run: uv pip install .
       - name: Run tests