A few problems

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.234.0/containers/debian/.devcontainer/base.Dockerfile
+
+# [Choice] Debian version (use bullseye on local arm64/Apple Silicon): bullseye, buster
+ARG VARIANT="buster"
+FROM mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
+
+# ** [Optional] Uncomment this section to install additional packages. **
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.234.0/containers/debian
+{
+	"name": "Debian",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick an Debian version: bullseye, buster
+		// Use bullseye on local arm64/Apple Silicon.
+		"args": { "VARIANT": "bullseye" }
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"rust-lang.rust-analyzer"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Uncomment to use the Docker CLI from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker.
+	// "mounts": [ "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind" ],
+
+	// Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+	// "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode",
+	"containerUser": "vscode",
+	"workspaceMount": "source=${localWorkspaceFolder},target=/workspaces/${localWorkspaceFolderBasename},type=bind,Z",
+	"runArgs": [
+		"--userns=keep-id"
+	],
+
+	"features": {
+		"rust": "latest"
+	}
+}