Print information about NGINX version

[aledbf]

Which issue this PR fixes : fixes #2468

[ElvinEfendi]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, ElvinEfendi

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[codecov-io]

Codecov Report

Merging #2575 into master will increase coverage by 0.06%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #2575      +/-   ##
=========================================
+ Coverage   40.63%   40.7%   +0.06%     
=========================================
  Files          74      75       +1     
  Lines        5094    5103       +9     
=========================================
+ Hits         2070    2077       +7     
- Misses       2743    2746       +3     
+ Partials      281     280       -1

Impacted Files	Coverage Δ
cmd/nginx/nginx.go	0% <0%> (ø)
cmd/nginx/main.go	28.78% <0%> (+5.12%)	⬆️

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