Start nginx with -e stderr parameter

[lucacome]

NGINX tries to open /var/log/nginx/error.log (the default error log) before loading the configuration. We don't have that file because we write directly to stderr.
In some configurations, this will result in an error line like this

nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)

With this change, we tell NGINX that we want to use stderr during startup and reload, i.e. before the configuration is loaded.

[codecov-commenter]

Codecov Report

Merging #2404 (b636a8b) into master (1e38b54) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2404      +/-   ##
==========================================
- Coverage   53.69%   53.65%   -0.05%     
==========================================
  Files          48       48              
  Lines       14203    14203              
==========================================
- Hits         7627     7621       -6     
- Misses       6338     6342       +4     
- Partials      238      240       +2     

Impacted Files	Coverage Δ
internal/nginx/manager.go	0.00% <0.00%> (ø)
...ternal/k8s/appprotect/app_protect_configuration.go	86.16% <0.00%> (-0.58%)	⬇️
internal/k8s/configuration.go	95.47% <0.00%> (-0.39%)	⬇️

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