SNOW-685438: Sign Nuget artifacts before release

[sfc-gh-anavalos]

Description

Signing artifacts right after they are built with Cosign. The signature files will be added to the release tag.
The signing process follow the next steps:

• Download the signing script from S3
  • Generates random password
  • Generates key pairs
  • Sign artifacts
  • Verify signature
  • Copy signature files (public key and sig files).
  • Delete signature files(public key, private key, and sig files).

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.59%. Comparing base (18f495a) to head (5d9b61b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1001      +/-   ##
==========================================
- Coverage   85.68%   85.59%   -0.09%     
==========================================
  Files         106      106              
  Lines       10777    10777              
  Branches     1032     1032              
==========================================
- Hits         9234     9225       -9     
- Misses       1295     1304       +9     
  Partials      248      248              

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[sfc-gh-eraigosa]

LGTM

[sfc-gh-kdama]

👍