Update permissions of gateway binary for UBI (#4404)

[shaun-nx]

Proposed changes

Cherry-pick of #4404 Update permissions of gateway binary for UBI

This change ensures that the gateway binary that we copy to /usr/bin/gateway in our UBI Control Plane Dockerfile has the appropriate permissions to run.

Currently, this causes an error in our UBI deployments that prevents the certificate generator pod from running.

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Fix permission issue with nginx-gateway container for UBI 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.17%. Comparing base (6f62824) to head (85adc4f).
⚠️ Report is 1 commits behind head on release-2.2.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.2    #4416      +/-   ##
===============================================
- Coverage        86.18%   86.17%   -0.01%     
===============================================
  Files              131      131              
  Lines            14316    14316              
  Branches            74       74              
===============================================
- Hits             12338    12337       -1     
  Misses            1776     1776              
- Partials           202      203       +1     

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