use tar to retain executable bit in released assets

[weinong]

The test release looks good.

https://github.com/weinong/kubelogin/releases/tag/v0.2.2

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.41%. Comparing base (15edb67) to head (19b5b27).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
- Coverage   63.43%   54.41%   -9.03%     
==========================================
  Files          37       42       +5     
  Lines        2210     2354     +144     
==========================================
- Hits         1402     1281     -121     
- Misses        733      974     +241     
- Partials       75       99      +24     

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