Add CI migration smoke test

[bokelley]

Summary

• add a dedicated GitHub Actions workflow to run built database migrations against PostgreSQL
• stage server/src/db/migrations into dist/db/migrations so the CI path matches the Fly release artifact
• trigger the smoke test on migration, DB runner, build, and workflow changes

Validation

• staged dist/db/migrations locally to mirror the deploy artifact
• ran DATABASE_URL=postgresql://postgres:postgres@127.0.0.1:55434/adcp_test2 node dist/db/migrate.js against a disposable Postgres instance
• verified the run completed successfully through 340_purpose_mission_vision.sql

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
29376516	Triggered	Generic Password	b681d3a	.github/workflows/migration-smoke-test.yml	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}