[now-ruby] Add rack examples to ruby integration tests

[m5o]

• add basic rack examples to ruby integration tests
  • https://github.com/rack/rack

[vercel]

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[codecov-io]

Codecov Report

Merging #3626 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3626      +/-   ##
==========================================
- Coverage   14.06%   14.06%   -0.01%     
==========================================
  Files         275      275              
  Lines       11166    11178      +12     
  Branches     1539     1540       +1     
==========================================
+ Hits         1571     1572       +1     
- Misses       9426     9437      +11     
  Partials      169      169

Impacted Files	Coverage Δ
src/util/metrics.ts	61.53% <0%> (-6.65%)	⬇️
src/util/prefer-v2-deployment.ts	55.1% <0%> (-4.9%)	⬇️
src/util/projects/get-project-by-id-or-name.ts	19.04% <0%> (-4.49%)	⬇️

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[styfle]

Thanks! 🙌