Pass installer option via CLI instead of requirements file

[sbidoul]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 7.47%. Comparing base (ce1e110) to head (020c8b9).

❗ Current head 020c8b9 differs from pull request most recent head 9f9a2f3. Consider uploading reports for the commit 9f9a2f3 to get more accurate results

Files	Patch %	Lines
src/pip_deepfreeze/req_merge.py	0.00%	22 Missing ⚠️
src/pip_deepfreeze/sync.py	0.00%	11 Missing and 1 partial ⚠️
src/pip_deepfreeze/utils.py	0.00%	4 Missing ⚠️
src/pip_deepfreeze/pip.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #138      +/-   ##
=========================================
- Coverage    7.50%   7.47%   -0.03%     
=========================================
  Files          17      17              
  Lines        1119    1123       +4     
  Branches      234     236       +2     
=========================================
  Hits           84      84              
- Misses       1023    1027       +4     
  Partials       12      12              

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