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

[Prarthana-35]

Adds a focused unit test suite for env_check.py at test_env_check.py
Adds CI to run tests across Python 3.10/3.11/3.12 via .github/workflows/test.yml.
Adds pytest.ini with project pytest configuration.
This PR is test-only: it does not change runtime behavior of env_check.py

Reason :
Improves automated test coverage and CI for the project.
Documents current behavior of env_check.py and identifies validations that should be hardened in a follow-up PR

Test plan / How to run locally

Create & activate Python venv (3.12 recommended).
Install deps:
pip install -r requirements.txt
pip install pytest pytest-cov pytest-timeout

python -m pytest test/test_env_check.py -v

---

Summary by cubic

Adds unit tests for utils/env_check.py and a CI workflow to run them on Python 3.10–3.12. Improves coverage and documents current env validation behavior; no runtime changes.

• New Features
  • Adds test/test_env_check.py covering version compatibility, redirect URL, broker-specific keys, rate limits, session expiry, ports, WebSocket, and logging; includes skips to mark validations not yet enforced.
  • Introduces GitHub Actions workflow to run pytest with coverage across 3.10/3.11/3.12, cache pip, and upload coverage.xml as an artifact (Codecov upload removed for fork safety).
  • Adds pytest.ini for test discovery, markers, and coverage settings (source=utils).

^{Written for commit 52af012. Summary will update automatically on new commits.}

[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (all 1 issues)

Understand the root cause of the following 1 issues and fix them.


<file name=".github/workflows/test.yml">

<violation number="1" location=".github/workflows/test.yml:48">
Codecov v4 now requires a token input (or CODECOV_TOKEN env); without it this step errors out and coverage upload never happens. Please supply the repository token when invoking the action.</violation>
</file>

---

Since this is your first cubic review, here's how it works:

• cubic automatically reviews your code and comments on bugs and improvements
• Teach cubic by replying to its comments. cubic learns from your replies and gets better over time
• Ask questions if you need clarification on any suggestion

_{React with 👍 or 👎 to teach cubic. Mention @cubic-dev-ai to give feedback, ask questions, or re-run the review.}

[cubic-dev-ai]

Codecov v4 now requires a token input (or CODECOV_TOKEN env); without it this step errors out and coverage upload never happens. Please supply the repository token when invoking the action.

Prompt for AI agents

Address the following comment on .github/workflows/test.yml at line 48:

<comment>Codecov v4 now requires a token input (or CODECOV_TOKEN env); without it this step errors out and coverage upload never happens. Please supply the repository token when invoking the action.</comment>

<file context>
@@ -0,0 +1,53 @@
+        pytest test/test_env_check.py -v --cov=utils --cov-report=xml --cov-report=term-missing
+    
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4
+      with:
+        file: ./coverage.xml
</file context>

✅ Addressed in 52af012