This PR contains the work done to introduce a _Fluent_-based persistence layer for the Website service, selectable at runtime alongside the existing in-memory default, plus the local dev tooling and docs to support it.
To provide further details about the work:
* Persistence package
* The `Driver` and `TLS` enumerations
* The `Configuration` type
* The `Service` factory that builds the service
* `PrepareDB` for migrations registration
* The `Probe` for readiness checks.
* App integration
* Builds the driver, registers migrations, and attaches `Fluent` to the service lifecycle so it starts/stops with the HTTP server.
* Migrate-on-boot is gated to the in-memory backend; MySQL/MariaDB is migrated out of band via --database-migrate so shared databases never race on startup.
* The `ConfigReader+Properties` extension maps database.* config keys onto the driver.
* Library
* Added database configuration constants.
* The `HealthController` controller gains a readiness probe: `GET /health/ready` checks whether the database is reachable, separate from the existing liveness check.
* Others
* Updated the `docker-compose` files to support a database service behind a database profile, and hardened for local development
* New database targets on the `Makefile` file and overall documentation updated
* Updated the `.env.local`, `Dockerfile`, and `README` files to document the persistence workflow, config keys, and local DB commands
Reviewed-on: rock-n-code/loud-amsterdam#13
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>
