Public 2022 images

[anamnavi]

PR Summary

Change FROM path to pull base image from different location when Windows LTSC 2022 releases publicly and let isPrivate in meta.json be false.

Pull from these locations for windowsservercore and nanoserver, respectively:
mcr.microsoft.com/windows/servercore:ltsc2022
mcr.microsoft.com/windows/server:ltsc2022

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all Dockerfile, .sh, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.
• Adds a new image or tag
  • Not Applicable
• OR
  • Update README.powershellcommunity.md
  • Update vsts-ci.yml

[TravisEz13]

hardcode dockerhost as we go public

[TravisEz13]

see comments

[azure-pipelines]

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