Precompile assets on CI before running tests.

[simi]

• trying to fix https://github.com/rubygems/rubygems.org/actions/runs/6123118617/job/16620328677?pr=4055, not sure if that's related, but maybe it timeouts on precompiling assets during system tests (I wasn't able to reproduce locally)

[codecov]

Codecov Report

Merging #4059 (d4196f0) into master (9f19e00) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4059   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files         268      268           
  Lines        6168     6168           
=======================================
  Hits         6107     6107           
  Misses         61       61           

[segiddins]

Are we concerned about this leading to CI having a different behavior than most people running tests locally?

[simi]

Are we concerned about this leading to CI having a different behavior than most people running tests locally?

TBH I'm not sure. Feel free to close this if you're not 100% sure about the impact. Splitting the CI at #4059 would make it easier to detect the original problem later if merged anyway.

[martinemde]

I've done this same thing to avoid timeouts during capybara tests. Is that what this aims to fix?

[simi]

I've done this same thing to avoid timeouts during capybara tests. Is that what this aims to fix?

Yes