update dockerfile for debian N+

[vepatel]

Proposed changes

Fixes #4503 by adding user explicitly

N+

nginx@test-release-nginx-ingress-controller-6b87ddbc7c-6rnpz:/$ cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
.
.
.
nginx:x:101:101:nginx user:/nonexistent:/bin/false

N+ with AP

                    appprotect.f5.com/app-protect-security-log-destination: /var/log/nginx/dev-waftests.log
                    appprotect.f5.com/app-protect-security-log-enable: True
Events:
  Type    Reason          Age   From                      Message
  ----    ------          ----  ----                      -------
  Normal  AddedOrUpdated  108s  nginx-ingress-controller  Configuration for default/cafe-ingress was added or updated
~/nginx/kubernetes-ingress/charts/nginx-ingress on main ● ● λ keti test-release-nginx-ingress-controller-6d94695fdb-58x25 -- bash     
nginx@test-release-nginx-ingress-controller-6d94695fdb-58x25:/$ ls /var/log/nginx/
access.log  dev-waftests.log  error.log

nginx@test-release-nginx-ingress-controller-6d94695fdb-58x25:/$ cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
.
.
.
nginx:x:101:101:nginx user:/nonexistent:/bin/false

Checklist

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

• 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

[vepatel]

cc @sigv

[codecov]

Codecov Report

Merging #4575 (c146ce8) into main (ecec4a6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4575   +/-   ##
=======================================
  Coverage   51.98%   51.98%           
=======================================
  Files          59       59           
  Lines       16967    16967           
=======================================
  Hits         8820     8820           
  Misses       7852     7852           
  Partials      295      295           

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