Add must-gather container

[iblancasa]

Closes #1033.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 369 lines in your changes missing coverage. Please review.

Project coverage is 69.22%. Comparing base (c39140e) to head (c88c945).

Files with missing lines	Patch %	Lines
cmd/gather/cluster/cluster.go	0.00%	247 Missing ⚠️
cmd/gather/cluster/write.go	0.00%	61 Missing ⚠️
cmd/gather/main.go	0.00%	34 Missing ⚠️
cmd/gather/config/config.go	0.00%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1034      +/-   ##
==========================================
- Coverage   73.08%   69.22%   -3.86%     
==========================================
  Files         106      110       +4     
  Lines        6624     6993     +369     
==========================================
  Hits         4841     4841              
- Misses       1493     1862     +369     
  Partials      290      290              

Flag	Coverage Δ
unittests	69.22% <0.00%> (-3.86%)	⬇️

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