✨ Wait for docker-postgres to "truly" start and accept connections

[sebald]

See docker-library/postgres#146 for more information

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@2fb42f3). Click here to learn what that means.
The diff coverage is 91.3%.

@@           Coverage Diff            @@
##             master      #1   +/-   ##
========================================
  Coverage          ?   91.3%           
========================================
  Files             ?       1           
  Lines             ?      46           
  Branches          ?       3           
========================================
  Hits              ?      42           
  Misses            ?       4           
  Partials          ?       0

Impacted Files	Coverage Δ
src/index.ts	91.3% <91.3%> (ø)

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