Create devcontainer.json

[starlightretailceo]

This pull request includes a small change to the .devcontainer/devcontainer.json file. The change specifies a new development container image.

• .devcontainer/devcontainer.json: Added a new development container image mcr.microsoft.com/devcontainers/universal:2.### Description

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[hashicorp-cla-app]

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[hashicorp-cla-app]

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