tests(env_check): add unit tests for env_check.py and CI workflow

.github/workflows/test.yml

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+name: Test OpenAlgo
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Cache pip packages
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install pytest pytest-cov pytest-timeout
+
+    - name: Create sample.env for testing
+      run: |
+        cp .sample.env .sample.env.backup || true
+
+    - name: Run tests with coverage
+      run: |
+        pytest test/test_env_check.py -v --cov=utils --cov-report=xml --cov-report=term-missing
+    - name: Upload coverage artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-xml
+        path: coverage.xml
+    # Note: Codecov upload removed to avoid requiring CODECOV_TOKEN on forks.
+    # Coverage XML is still uploaded as an artifact coverage-xml for reviewers to download.

pytest.ini

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+[pytest]
+testpaths = test
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+addopts = 
+    -v
+    --strict-markers
+    --tb=short
+markers =
+    slow: marks tests as slow (deselect with '-m "not slow"')
+    integration: marks tests as integration tests
+    unit: marks tests as unit tests
+
+[coverage:run]
+source = utils
+omit = 
+    */tests/*
+    */test/*
+    */__pycache__/*
+    */venv/*
+    */env/*
+
+[coverage:report]
+precision = 2
+show_missing = True
+skip_covered = False