install role: work around ansible-core bug

[felixfontein]

Fixes #223.

run_once: "{{ omit }}" simply does not work (and probably never did)...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.60%. Comparing base (96bb8d3) to head (dbe9300).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   83.60%   83.60%           
=======================================
  Files          12       12           
  Lines         726      726           
  Branches      142      142           
=======================================
  Hits          607      607           
  Misses         84       84           
  Partials       35       35           

Flag	Coverage Δ
integration	81.71% <ø> (ø)
sanity	29.61% <ø> (ø)

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