enable GCP cloud profiling on rekor-server

[bobcallaway]

enables profiling data to be captured when running rekor-server in GCP

[codecov]

Codecov Report

Merging #1746 (229a8b3) into main (75774ff) will decrease coverage by 0.03%.
Report is 5 commits behind head on main.
The diff coverage is 35.29%.

@@            Coverage Diff             @@
##             main    #1746      +/-   ##
==========================================
- Coverage   66.76%   66.74%   -0.03%     
==========================================
  Files          88       88              
  Lines        8919     8936      +17     
==========================================
+ Hits         5955     5964       +9     
- Misses       2252     2260       +8     
  Partials      712      712              

Flag	Coverage Δ
e2etests	48.51% <35.29%> (-0.03%)	⬇️
unittests	47.69% <ø> (+0.03%)	⬆️

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Files	Coverage Δ
cmd/rekor-server/app/root.go	62.85% <100.00%> (+2.25%)	⬆️
cmd/rekor-server/app/serve.go	72.22% <0.00%> (-13.03%)	⬇️

... and 1 file with indirect coverage changes