Add support for custom database schema for postgres

[gunnarvelle]

Make it possible to override schema for postgres database.
Also let stdout and stderr from workers reach kubernetes logging.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.05%. Comparing base (f30e7e8) to head (3e11df9).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3287   +/-   ##
=========================================
  Coverage     61.05%   61.05%           
  Complexity     3587     3587           
=========================================
  Files           410      410           
  Lines         15595    15595           
=========================================
  Hits           9522     9522           
  Misses         6073     6073           

Components	Coverage Δ
Content Author	66.73% <ø> (ø)
Hub	43.17% <ø> (ø)

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