Use custom NGF Debian image for tests

[lucacome]

Proposed changes

Problem: We're using a specific version of debian to create the VM. This image is deprecated. We also install all the dependencies needed every time we create the VM.

Solution: Create a custom image with all our dependencies and specify the image-family as a parameter so we can always use the latest version.

First pass at https://github.com/nginxinc/k8s-dev/issues/80 I think I'll probably upload the source code for building the image to https://github.com/nginxinc/k8s-common unless we want it in this repo.

Checklist

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• 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

Release notes

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NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.76%. Comparing base (57ab5e9) to head (8cb27a9).

Additional details and impacted files

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##             main    #2260   +/-   ##
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  Coverage   87.76%   87.76%           
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  Files          96       96           
  Lines        6793     6793           
  Branches       50       50           
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  Hits         5962     5962           
  Misses        774      774           
  Partials       57       57           

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[sjberman]

I'm assuming this is a manually built image that you've pushed right now? If so, I'd rather wait to remove this stuff until that image can be easily updated by anyone through some script/process.

This way we aren't blocked or limited by any one person who has to build it and push it.

[lucacome]

@sjberman I have a configuration for packer. I was planning to push it to https://github.com/nginxinc/k8s-common since it just creates a debian image with helm, kubectl, go, etc. installed, nothing specific for this repo.

The next step is to automate the creation of that image to keep it up-to-date, but I don't think it's really urgent since it would just update the base image and the version of the tools. So we should be good for a while.