✨ Windmill: Add Postgres-Backed Integration Tests for SQL Logic

[Findeton]

Parent issue: https://github.com/sequentech/meta/issues/11564

[Copilot]

Pull request overview

Adds an automated SQL regression test for Windmill’s “latest cast vote per voter” query by introducing a Postgres bootstrapping helper and wiring the ignored test into CI.

Changes:

• Introduces TestDatabase helper to bootstrap a Postgres DB by extracting devcontainer init SQL and applying Hasura backend migrations.
• Refactors find_area_ballots SQL construction into a helper that validates UUID inputs, and adds an integration test asserting latest vote selection per voter.
• Adds a dedicated GitHub Actions job to run the ignored SQL regression test; updates .gitignore.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/windmill/src/test_database.rs	New test-only Postgres bootstrap utility (init SQL extraction + migrations + optional local Postgres process).
packages/windmill/src/services/cast_votes.rs	Adds UUID-validating SQL builder for the COPY query and an ignored integration test using TestDatabase.
packages/windmill/src/lib.rs	Exposes test_database module under #[cfg(test)].
.github/workflows/tests.yml	Adds CI job to run the ignored Windmill SQL regression test with a Postgres service container.
.gitignore	Normalizes airgapped-artifacts ignore and adds beyond/.

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