Buildkite CI configuration for GPU testing.

[fredrikekre]

For #913

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (0ccd128) to head (322b7f3).
Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (0ccd128) and HEAD (322b7f3). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (0ccd128)	HEAD (322b7f3)
	5	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #1093       +/-   ##
==========================================
- Coverage   93.72%   0.00%   -93.73%     
==========================================
  Files          39      39               
  Lines        6008    5930       -78     
==========================================
- Hits         5631       0     -5631     
- Misses        377    5930     +5553     

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