https://github.com/devcontainers/templates/blob/c07f2f0ae924efd391ac2c5495db1366166b70f0/src/cpp/.devcontainer/Dockerfile#L1

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Note

templates/src/cpp/.devcontainer/Dockerfile

Line 1 in c07f2f0

FROM mcr.microsoft.com/devcontainers/cpp:2-${templateOption:imageVariant}