Add Jenkins timeout

[StefanScherer]

Signed-off-by: Stefan Scherer stefan.scherer@docker.com

- What I did

I've added a timeout to the Jenkins job, I saw https://ci.docker.com/teams-dsg/job/dsg/job/app/view/change-requests/job/PR-788/6/ running "forever".

- How I did it

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory)

⏱

[silvin-lubecki]

LGTM

[codecov]

Codecov Report

Merging #790 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #790   +/-   ##
=======================================
  Coverage   70.03%   70.03%           
=======================================
  Files          67       67           
  Lines        3684     3684           
=======================================
  Hits         2580     2580           
  Misses        759      759           
  Partials      345      345

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