Add possibility to provide custom pod annotations

[Robsta86]

Proposed changes

Problem: Currently the helm chart does not provide an option to configure custom annotations for the nginx-gateway-fabric pod(s). In our scenario this is inconvenient because the pre-configured annotations Prometheus specific, but we are using Grafana Alloy to scrape metrics and Alloy is expecting different annotations. Of course there are also other scenarios where custom annotations can be useful, for instance to configure exceptions for Gatekeeper policies.

Solution: This Pull Request adds the possibility to configure your own custom annotations which will be added to the nginx-gateway-fabric pods.

Testing: Tested by installing the helm chart with the default values, and after that installing the helm chart with custom annotations configured.

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

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Add capability to configure custom annotations for the nginx-gateway-fabric pod(s)

[nginx-bot]

Hi @Robsta86! Welcome to the project! 🎉

Thanks for opening this pull request!
Be sure to check out our Contributing Guidelines while you wait for someone on the team to review this.

Please make sure to include the issue number in the PR description to automatically close the issue when the PR is merged.
See Linking a pull request to an issue and our Pull Request Guidelines for more information.

[kate-osborn]

@Robsta86 thanks for the contribution!

Can you run make generate-all and commit/push the changes? That should resolve the pipeline issue. Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.62%. Comparing base (365a683) to head (46fd4eb).

Additional details and impacted files

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  Coverage   87.62%   87.62%           
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  Files          96       96           
  Lines        6715     6715           
  Branches       50       50           
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  Hits         5884     5884           
  Misses        774      774           
  Partials       57       57           

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