chore: document how to disable iam generation

[markussiebert]

Fixes #

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.80%. Comparing base (7f8a318) to head (d330220).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1093   +/-   ##
=======================================
  Coverage   71.80%   71.80%           
=======================================
  Files           3        3           
  Lines         461      461           
=======================================
  Hits          331      331           
  Misses         91       91           
  Partials       39       39           

Flag	Coverage Δ
go-lambda	71.80% <ø> (ø)

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