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3e750d10 - Devcontainer: Replace Dockerfile with prebuilt image+features (#82450)

Devcontainer: Replace Dockerfile with prebuilt image+features (#82450) Devcontainers support custom `Dockerfile`s, but it seems like it's more recommended to use a base image with "features" on top: https://containers.dev/implementors/features/ Features get applied after the `Dockerfile`, so e.g. if we're installing `rust` with a feature, then we can't install things that depend on `rust` (e.g. `cargo-nextest`: https://nexte.st/) in the `Dockerfile`. So you're forced to do things with features instead, which can specify dependencies and ordering requirements. I removed a bunch of comments that were left over from the template. People wishing to update this file should refer to the https://aka.ms/devcontainer.json link at the top of the file. Also added a lockfile for the features, generated with: ``` devcontainer upgrade --workspace-folder=. ``` **Note:** The `base.Dockerfile` here was entirely unused. ### Testing ``` podman stop --all && podman rm --all # replace podman with docker if you're using docker devcontainer up --workspace-folder=. devcontainer exec --workspace-folder=. zsh ```