NOTICE: Name change features.* --> devcontainer-features.*

[joshspicer]

A recent breaking change was introduced to our preview for dev container features.

Everywhere a file had been called features.{tgz, json} is now named devcontainer-features.{tgz, json}.

Codespaces and Remote-Containers has now been updated to expect these names, and the previous names will cause a build error.

Steps to update:

1. Update this line in your local copy of the template to emit the release artifact with the new name
   • dev-container-features-template -> deploy-features.yml#L27
2. Re-release your features on a new tag
   • Using commit microsoft/publish-dev-container-features-action@b92badd of the action (or newer).

Please note that any older releases prior to this change will no longer work.

Thanks for experimenting and bearing with us during the feature preview. If you have any further feedback, PLEASE let us know over at the dev-container-spec repo.

Context: microsoft/vscode-remote-release#5980