allow install's flags

[Borda]

Before submitting

• Was this discussed/approved via a GitHub issue? (no need for typos and docs improvements)
• Did you create/update your configuration file?
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• Did you add your config to CI in Azure pipeline (only projects with 100+ GitHub stars)?
• Are all integration tests passing?

What does this PR do? [optional]

Adding an option to specify install flags
it is needed for #71 and #72

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #75 (a18d750) into main (2f04fba) will decrease coverage by 1%.
The diff coverage is 81%.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #75   +/-   ##
==================================
- Coverage    86%   85%   -1%     
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  Files         2     2           
  Lines       219   230   +11     
==================================
+ Hits        189   196    +7     
- Misses       30    34    +4