Fix logrotate permissions

[karensantana]

Proposed changes

When logrotate runs (through systemd timer or manually), it ignores /etc/logrotate.d/nginx-agent because its permissions are 0664 (group-writable) instead of 0644. This PR fixes this behavior by setting the permissions of the logrotate config file to 644.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.85%. Comparing base (afadb67) to head (242c90e).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1770      +/-   ##
==========================================
+ Coverage   84.83%   84.85%   +0.01%     
==========================================
  Files         105      105              
  Lines       13656    13658       +2     
==========================================
+ Hits        11585    11589       +4     
+ Misses       1548     1544       -4     
- Partials      523      525       +2     

see 3 files with indirect coverage changes

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