Add Debian 12 support

[dhurley]

Proposed changes

Add Debian 12 support

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

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[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.14% ⚠️

Comparison is base (710d436) 67.08% compared to head (51ff42f) 66.95%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #442      +/-   ##
==========================================
- Coverage   67.08%   66.95%   -0.14%     
==========================================
  Files         113      113              
  Lines       12840    12849       +9     
==========================================
- Hits         8614     8603      -11     
- Misses       3657     3678      +21     
+ Partials      569      568       -1     

Files Changed	Coverage Δ
src/core/environment.go	51.95% <0.00%> (ø)
src/core/nginx.go	44.62% <100.00%> (-1.24%)	⬇️

... and 5 files with indirect coverage changes

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