Set buildtools variable used for android App signing

[jonasanker]

Reference: r0adkll/sign-android-release#84 (comment)

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Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@8c361ad). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #568   +/-   ##
=======================================
  Coverage        ?   72.36%           
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  Files           ?      133           
  Lines           ?     1603           
  Branches        ?        0           
=======================================
  Hits            ?     1160           
  Misses          ?      443           
  Partials        ?        0           

Flag	Coverage Δ
unittests	72.36% <0.00%> (?)

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