Add review instructions for build infra and root config

[lmolkova]

We had no Copilot review instructions for build infrastructure and root-level config, so PRs touching them were reviewed against no repo rules; this adds a repo-wide copilot-instructions.md and an applyTo file covering tox.ini, pytest.ini, root pyproject.toml, and scripts/.

[opentelemetry-pr-dashboard]

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Merged · refreshed 2026-08-14 20:59 UTC

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[Copilot]

Pull request overview

This PR adds repository-wide GitHub Copilot review guidance for changes that touch build/test/CI infrastructure and root-level configuration, aiming to ensure reviews catch issues CI can’t detect (e.g., silently reduced coverage or incomplete tox wiring).

Changes:

• Adds a build/config-focused instruction file scoped to root config, scripts/, and CI workflows.
• Adds repo-wide “what not to flag” guidance to avoid duplicating deterministic CI gate findings.
• Documents root-config shadowing behavior (e.g., per-package pyproject.toml overriding root pytest.ini).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/instructions/build-config.instructions.md	New scoped review rules for build/test matrix/CI config changes.
.github/copilot-instructions.md	New repo-wide baseline rules (including CI-gate “don’t duplicate” guidance and root-config shadowing notes).

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