docs: add brew trust step for Homebrew 6

[leonid-shevtsov]

What & why

Homebrew 6 requires trusting third-party formulae before install. Found while testing brew install from the mailtrap/local tap — README was missing the trust step.

• Add brew trust --formula mailtrap/local/mailtrap-local to the Homebrew install block

How to test

No QA needed — docs-only.

Summary by CodeRabbit

• Documentation
  • Updated the Homebrew Quick Start instructions to include a trust step, ensuring the formula installation flow works as documented.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 69de2c8b-12d5-4544-a6f9-09f9395a532f

📥 Commits

Reviewing files that changed from the base of the PR and between 6f57564 and 11f102b.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README Homebrew quick-start instructions now add a formula trust command immediately after adding the mailtrap/local tap.

Changes

Homebrew documentation

Layer / File(s)	Summary
Add Homebrew formula trust step README.md	The Homebrew installation flow adds brew trust --formula mailtrap/local/mailtrap-local after the tap command.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• mailtrap/mailtrap-local#43: Updates related README/Homebrew instructions for the same tap publishing workflow.

Suggested reviewers: sergeykorolev

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the docs change to add the Homebrew trust step.
Description check	✅ Passed	It includes the main motivation, change summary, and testing note; the missing images/GIFs section is non-critical for this docs-only PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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