Implement persistent storage and the pressure algorithm using PostgreSQL database

[weiiwang01]

Overview

Implement persistent storage and the pressure algorithm using PostgreSQL database.

Rationale

Checklist

• The PR is tagged with appropriate label (urgent, trivial, senior-review-required, documentation).

[yanksyoon]

Reviewed up to database.go, looks great so far! thanks!

[cbartz]

Thanks. Some questions around testing.

[Copilot]

Pull Request Overview

This PR implements persistent storage and the pressure algorithm using PostgreSQL database. The changes introduce a comprehensive database layer for managing auth tokens, jobs, and flavors, with a sophisticated job-to-flavor assignment algorithm based on priority and pressure metrics.

• Adds PostgreSQL database integration with pgx driver and migrations
• Implements pressure-based job assignment algorithm for optimal resource allocation
• Converts tests from integration-only to unit tests with database mocking

Reviewed Changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
webhook_gateway_rockcraft.yaml	New Rockcraft configuration for webhook-gateway container build
webhook-gateway/webhook_test.go	Simplified tests by removing integration flag and converting fatal errors to skips
internal/database/model.go	Database models for Flavor and Job entities with JSON/DB tags
internal/database/migrations/0001_init.up.sql	Initial database schema with tables, indexes, and constraints
internal/database/migrations/0001_init.down.sql	Migration rollback script for schema cleanup
internal/database/migration.go	Database migration utilities using golang-migrate
internal/database/database_test.go	Comprehensive test suite covering all database operations
internal/database/database.go	Core database implementation with pressure algorithm and CRUD operations
go.mod	Added PostgreSQL and migration dependencies
.github/workflows/webhook_gateway_tests.yaml	Removed dedicated webhook gateway integration test workflow
.github/workflows/tests.yaml	Enhanced with PostgreSQL and RabbitMQ services for comprehensive testing

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[yanksyoon]

LGTM, one minor nit: we could provide just database connections in database.go and add service layers on top (i.e. auth, flavor, pressure) to separate the code logically. But it looks good as is since there isn't too much code.

[weiiwang01]

database.go

Yes, but the auth, flavor, and pressure are all just different SQL queries in this implementation, so they can’t be separated from the database logic.