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 85.12%. Comparing base (29fdf22) to head (8c2af13).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1770      +/-   ##
==========================================
- Coverage   85.18%   85.12%   -0.06%     
==========================================
  Files         105      105              
  Lines       13759    13759              
==========================================
- Hits        11721    11713       -8     
- Misses       1514     1522       +8     
  Partials      524      524              

see 1 file with indirect coverage changes

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