fix: fix coverage report upload in workflow (wip)

[lnfjpt]

Fixes

Greptile Summary

This PR adds the CODECOV_TOKEN secret to the Upload coverage to Codecov step in .github/workflows/neug-test.yml, fixing authenticated uploads that were likely failing due to the missing token.

• What changed: The token: ${{ secrets.CODECOV_TOKEN }} input was added to the codecov/codecov-action@v4 step.
• Why it's needed: Codecov requires an upload token for private repositories (and increasingly for public ones with v4 of the action), so omitting it causes uploads to be rejected or silently dropped.
• Risk: The change is minimal and well-scoped — it only affects the coverage-upload step, which is already gated behind a strict condition (main branch push on the canonical repository).

Confidence Score: 5/5

• This PR is safe to merge — the change is a single-line, well-understood CI fix with no impact on application code.
• Only one line is added to a CI workflow file: the Codecov upload token. The change is low-risk, targeted, and follows the recommended usage pattern for codecov/codecov-action@v4. The secret is referenced via the GitHub Secrets mechanism, so no credentials are exposed.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/neug-test.yml	Adds CODECOV_TOKEN secret to the Codecov upload step — a straightforward fix that enables authenticated coverage uploads; no logic issues found.

Sequence Diagram

sequenceDiagram
    participant GH as GitHub Actions Runner
    participant CC as Codecov Service

    GH->>GH: Run tests & generate coverage.info
    alt main branch push
        GH->>CC: Upload coverage report<br/>(with CODECOV_TOKEN secret)
        CC-->>GH: Upload acknowledged
    else other branches / non-push events
        GH->>GH: Skip upload (condition not met)
    end

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_{Last reviewed commit: f5b541d}

[codecov-commenter]

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