Add devcontainer configuration

Adds basic devcontainer configuration using Microsoft's
rust:1-1-bookworm container.

The existing recommended extensions are included.

Author: deadmeu

.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/devcontainers/templates/tree/main/src/rust
+{
+	"name": "Rust",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/rust:1-1-bookworm",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"foxundermoon.shell-format",
+				"streetsidesoftware.code-spell-checker"
+			]
+		}
+	},
+
+	// Use 'mounts' to make the cargo cache persistent in a Docker Volume.
+	// "mounts": [
+	// 	{
+	// 		"source": "devcontainer-cargo-cache-${devcontainerId}",
+	// 		"target": "/usr/local/cargo",
+	// 		"type": "volume"
+	// 	}
+	// ]
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "./.devcontainer/postCreateCommand.sh"
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.devcontainer/postCreateCommand.sh

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+#!/bin/sh
+
+sudo apt update && sudo apt install -y --no-install-recommends \
+    clang