fix: app now stops on Ctrl+C when running in Docker

[8uben]

Replace shell pipeline (| pino-pretty) with fastify-cli's built-in options loading (-o). The logger transport with pino-pretty (singleLine) is configured via the exported 'options' constant in server/plugin.js.

Using 'exec' makes fastify PID 1, so Docker signals (SIGINT/SIGTERM) are delivered directly to the Node.js process instead of being lost by the shell.

Closes #11

Rebuild the image before running

$ docker run -p 3000:3000 -e SERVER_MESSAGE="Hexlet Awesome Server" -e SENTRY_DSN="<your dsn>" hexletcomponents/devops-example-app
[17:16:29.427] INFO (1): incoming request {"reqId":"req-5","req":{"method":"GET","url":"/assets/css/bootstrap.min.css.map","host":"localhost:3000","remoteAddress":"172.17.0.1","remotePort":32854}}
[17:16:29.429] INFO (1): request completed {"reqId":"req-5","res":{"statusCode":200},"responseTime":1.9774219989776611}
[17:16:29.461] INFO (1): incoming request {"reqId":"req-6","req":{"method":"GET","url":"/favicon.ico","host":"localhost:3000","remoteAddress":"172.17.0.1","remotePort":32854}}
[17:16:29.461] INFO (1): Route GET:/favicon.ico not found {"reqId":"req-6"}
[17:16:29.462] INFO (1): request completed {"reqId":"req-6","res":{"statusCode":404},"responseTime":0.43787600100040436}
^CReceived signal SIGINT
[17:16:32.880] WARN (1): Closed