test: CI SMTP send+confirm smoke for binary and Docker

[leonid-shevtsov]

What & why

CI was only hitting HTTP; SMTP send path untested. Add a TypeScript smoke that shells out to curl for SMTP (same as the in-app sample), then assert the message appears via the API — wired into build and docker jobs.

Summary by CodeRabbit

• Tests

  • Added automated SMTP smoke testing to verify that messages can be sent and retrieved successfully.
  • Expanded build and Docker image checks to cover email delivery and service startup behavior.

• Chores

  • Improved continuous integration coverage and documentation for detecting email and container-level regressions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d15662fa-5254-4416-af8a-6b392fcc6707

📥 Commits

Reviewing files that changed from the base of the PR and between 14b77b3 and 51ea871.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• scripts/smoke-smtp.ts

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📝 Walkthrough

Walkthrough

The PR adds a TypeScript SMTP smoke test and runs it in build, Dockerfile image, and goreleaser image CI checks. The test waits for API readiness, sends an email, and confirms the generated subject.

Changes

SMTP CI coverage

Layer / File(s)	Summary
SMTP smoke-test flow scripts/smoke-smtp.ts	The script validates environment variables, waits for the HTTP API, sends an SMTP message with curl, polls the messages endpoint, and reports failures.
Build and image-test integration .github/workflows/ci.yml	The workflow runs SMTP checks against local services and both container images. The Docker job installs Node.js 22 and updates its check documentation.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant CI
  participant HTTP_API
  participant SMTP
  participant Messages_API
  CI->>HTTP_API: Poll readiness endpoint
  CI->>SMTP: Send test email
  CI->>Messages_API: Poll for generated subject
  Messages_API-->>CI: Confirm message

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Possibly related PRs

• mailtrap/mailtrap-local#10: Adds the Docker image startup checks extended by this PR.

Suggested reviewers: sergeykorolev

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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