[DEVOPS-1785] Fix publish ruby sdk workflow permissions

[michalchecinski]

Type of change

- [x] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [x] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

Code changes

• .github/workflows/publish-ruby.yml: Add contents: read permission and fix indentation

Before you submit

• Please add unit tests where it makes sense to do so

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (74eecad) 59.40% compared to head (3656823) 59.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #625   +/-   ##
=======================================
  Coverage   59.40%   59.40%           
=======================================
  Files         171      171           
  Lines       10345    10345           
=======================================
  Hits         6145     6145           
  Misses       4200     4200           

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