feat: Add Trilogy adapter support with MariaDB 12.0+

[seuros]

• Add third database connection using GitHub's Trilogy adapter
• Create Trilogy models (TrilogyTag, TrilogyTagAudit, TrilogyLabel)
• Update all test suites to include Trilogy adapter tests
• Configure CI workflow to test with MariaDB alongside MySQL and PostgreSQL
• Add rake task for Trilogy database setup

This enables testing with_advisory_lock across three different database adapters:

• PostgreSQL (primary)
• MySQL with mysql2 (secondary)
• MariaDB 12.0+ with Trilogy (trilogy)

fixes #129

[Copilot]

Pull Request Overview

Adds support for the Trilogy adapter (GitHub's MariaDB/MySQL driver) to enable testing with_advisory_lock functionality across three different database adapters: PostgreSQL, MySQL2, and Trilogy with MariaDB 12.0+.

• Introduces Trilogy models (TrilogyTag, TrilogyTagAudit, TrilogyLabel) that mirror existing PostgreSQL and MySQL models
• Updates all existing test suites to include Trilogy adapter test cases
• Configures CI workflow to test against MariaDB alongside existing PostgreSQL and MySQL databases

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/with_advisory_lock/thread_test.rb	Adds TrilogyThreadTest class for thread-based lock testing
test/with_advisory_lock/shared_test.rb	Adds TrilogySharedLocksTest for shared lock behavior validation
test/with_advisory_lock/parallelism_test.rb	Adds TrilogyParallelismTest for concurrent lock testing
test/with_advisory_lock/multi_adapter_test.rb	Extends isolation tests to verify all three adapters don't interfere
test/test_helper.rb	Adds DATABASE_URL_TRILOGY environment variable validation
test/sanity_check_test.rb	Extends database isolation and adapter verification tests
test/dummy/lib/tasks/trilogy.rake	Provides Rake tasks for Trilogy database setup and schema loading
test/dummy/db/trilogy_schema.rb	Defines database schema for Trilogy test models
test/dummy/config/database.yml	Adds Trilogy database configuration
test/dummy/app/models/trilogy_*.rb	Creates Trilogy model classes mirroring existing test structure
.github/workflows/ci.yml	Adds MariaDB service and Trilogy environment configuration

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