[RTC-422] Allow for passing arguments to mix tasks

[roznawsk]

No description provided.

[codecov]

Codecov Report

Merging #50 (3a766b9) into master (671b153) will increase coverage by 82.01%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #50       +/-   ##
===========================================
+ Coverage        0   82.01%   +82.01%     
===========================================
  Files           0       16       +16     
  Lines           0      228      +228     
===========================================
+ Hits            0      187      +187     
- Misses          0       41       +41     

Files	Coverage Δ
lib/mix/tasks/test_with_docker.ex	0.00% <0.00%> (ø)

... and 15 files with indirect coverage changes

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