Use nginxcontrib/nginx as base image for UBI

[lucacome]

nginxcontrib/nginx-ubi:1.23.1 mimics nginx:1.23.1 and nginx:1.23.1-alpine but for UBI.

• Removes the need to manually add the nginx user
• Removes the need to manually add the nginx repo
• Adds builds for linux/ppc64le
• The image adds nginx-module-xslt, nginx-module-image-filter and nginx-module-njs like for debian and alpine

[codecov-commenter]

Codecov Report

Merging #2845 (af95533) into main (af95533) will not change coverage.
The diff coverage is n/a.

❗ Current head af95533 differs from pull request most recent head 236db07. Consider uploading reports for the commit 236db07 to get more accurate results

@@           Coverage Diff           @@
##             main    #2845   +/-   ##
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  Coverage   52.56%   52.56%           
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  Files          58       58           
  Lines       16069    16069           
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  Hits         8446     8446           
  Misses       7347     7347           
  Partials      276      276           

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[hafe]

This is not a good idea since users would not be able to (re)build the final image when RH has released a new version of the base image (e.g. with CVE fixes).

[lucacome]

This is not a good idea since users would not be able to (re)build the final image when RH has released a new version of the base image (e.g. with CVE fixes).

@hafe why wouldn’t users be able to rebuild the final image?

[hafe]

This is not a good idea since users would not be able to (re)build the final image when RH has released a new version of the base image (e.g. with CVE fixes).

@hafe why wouldn’t users be able to rebuild the final image?

Sorry I misread the diff! Now I see redhat/ubi8 is still the base image!