Potential fix for code scanning alert no. 78: Workflow does not contain permissions

[poopoothegorilla]

Potential fix for https://github.com/smartcontractkit/chainlink-evm/security/code-scanning/78

To fix the issue, we should explicitly restrict GITHUB_TOKEN permissions in this workflow. Since none of the jobs perform repository writes via the API or push commits, they can safely run with read‑only repository contents permissions. The recommended pattern is to add a permissions: block at the top level of the workflow so it applies to all jobs (build-test-matrix, build-test, and check-tidy), unless a job overrides it.

The single best fix is to add:

permissions:
  contents: read

near the top of .github/workflows/build-test.yml, alongside name: and on:. This documents the intent and ensures the token stays limited even if organization defaults change. No other code or steps need to be modified, and no additional permissions (like pull-requests: write) are necessary based on the provided snippet.

Concretely:

• Edit .github/workflows/build-test.yml.
• Insert a top-level permissions: block after the on: declaration (line 3–4 area).
• Keep indentation consistent with YAML top-level keys.

No imports or additional methods are required; this is purely a configuration change in the workflow YAML.

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[github-actions]

✅ API Diff Results - No breaking changes

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