use Adobe s3mock library

[sullis]

https://github.com/adobe/S3Mock

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.20%. Comparing base (fda0e51) to head (1e36afe).
Report is 14 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1178      +/-   ##
============================================
- Coverage     55.40%   55.20%   -0.21%     
+ Complexity      930      929       -1     
============================================
  Files           180      180              
  Lines          4606     4605       -1     
  Branches        603      605       +2     
============================================
- Hits           2552     2542      -10     
- Misses         1896     1903       +7     
- Partials        158      160       +2     

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[sullis]

ready for review

[sullis]

WDYT @bennetelli

[hennr]

Thanks for your contribution, @sullis !