Document our responsibility on Etcher (#17809)

wiki/src/contribute/working_together/roles/technical_writer.mdwn

@@ -29,6 +29,10 @@ as a fallback if no other contributor volunteers to do it.
     provided by our Help Desk and triaged by the Foundations Team.
   - Keeping our documentation and support pages efficient for the people
     reading them (relevant and easy to navigate).
+  - Maintain our dependency on tools that we instruct people to use in
+    our documentation but that are not part of Tails. For example,
+    testing, updating, and debugging *Etcher* or the Secure Boot utilities
+    of macOS.
 
 As technical writers have a limited amount of time to dedicate to these
 tasks, Tails as a project should redefine priorities on a regular basis.