Add @douglascamata to triagers (thanos-io#6418)

Signed-off-by: Douglas Camata <[email protected]>

MAINTAINERS.md

@@ -40,6 +40,7 @@ Full list of triage persons is displayed below:
 | Xiang Dai        | `@daixiang0`        | [@daixiang0](https://github.com/daixiang0)         |         |
 | Jimmie Han       | `@hanjm`            | [@hanjm](https://github.com/hanjm)                 | Tencent |
 | Michael Hoffmann | `@Michael Hoffmann` | [@MichaHoffmann](https://github.com/MichaHoffmann) | Aiven   |
+| Douglas Camata   | `@douglascamata`    | [@douglascamata](https://github.com/douglascamata) | Red Hat |
 
 Please reach any of the maintainer on slack or email if you want to help as well.