📝(ARSN-537) add the release process documentation

[DarkIsDude]

https://scality.atlassian.net/browse/ARSN-537

[bert-e]

Hello darkisdude,

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Status report is not available.

[bert-e]

Incorrect fix version

The Fix Version/s in issue ARSN-537 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 8.2.38

• 8.3.0

• 8.4.0

Please check the Fix Version/s of ARSN-537, or the target
branch of this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.40%. Comparing base (a000b51) to head (2a414c8).

Additional details and impacted files

@@               Coverage Diff                @@
##           development/8.2    #2569   +/-   ##
================================================
  Coverage            71.40%   71.40%           
================================================
  Files                  221      221           
  Lines                17816    17816           
  Branches              3705     3681   -24     
================================================
  Hits                 12721    12721           
  Misses                5091     5091           
  Partials                 4        4           

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[bert-e]

Request integration branches

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