chore(rails): add postgresql to test/CI

[solnic]

WIP

#skip-changelog

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 90.11%. Comparing base (5c3c53d) to head (dce46cb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2788   +/-   ##
=======================================
  Coverage   90.11%   90.11%           
=======================================
  Files         132      132           
  Lines        5293     5293           
=======================================
  Hits         4770     4770           
  Misses        523      523           

Components	Coverage Δ
sentry-ruby	97.26% <ø> (ø)
sentry-rails	55.31% <ø> (ø)
sentry-sidekiq	95.05% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)

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