Benjamin Woodruff 3e750d104f 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
```

2025-08-08 10:14:30 -07:00

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