Azure Firewall custom DNS server

[juang903]

Overview/Summary

Adds support for configuring the custom DNS server used in Azure Firewall

This PR fixes/adds/changes/removes

1. Adds the options to configure custom DNS server in Azure Firewall
2. Changes markdown files as appropriate

Testing Evidence

Entered an array of IPs and verified they were set in Azure Firewall DNS. Entered an empty array and verified that Default (azure provided) DNS is selected. No errors on deployment.

[jtracey93]

Thanks @juang903, could you also add it to the VWAN Module? https://github.com/Azure/ALZ-Bicep/tree/main/infra-as-code/bicep/modules/vwanConnectivity

[jtracey93]

Thanks again @juang903 could you also add the new parameter with its default value to the parameters.all.json files for each module respectively as well please? 👍

[juang903]

@jtracey93 Thanks, I added the params. I also added params for my last bastion PR since those weren't added previously, hope that's ok.

[jtracey93]

Thanks @juang903, all good. Can you please fix the linting errors here: https://github.com/Azure/ALZ-Bicep/actions/runs/5941466329/job/16169596767?pr=615

Installing EditorConfig VSCode extension should help you here

[microsoft-github-policy-service]

This pull request has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 7 days. It will be closed if no further activity occurs within 7 days of this comment.

[jtracey93]

Hi @juang903,

Are you able to resolve the linting errors by installing editorConfig in VSCode and formatting the edited files youve touched?

[juang903]

Hi @jtracey93
I think the linting errors are resolved now.

[jtracey93]

LGTM

[jtracey93]

/azp run validateazcloud

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