add wasm32-unknown-unknown

Author: lee-orr

src/wasm32-unknown-unknown/README.md

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+
+# Cargo Watch Dev Container
+
+A feature to install cargo watch
+
+## Example Usage
+
+```json
+"features": {
+    "ghcr.io/devcontainers/feature-starter/color:1": {
+        "version": "latest"
+    }
+}
+```
+
+## Options
+
+| Options Id | Description | Type | Default Value |
+|-----|-----|-----|-----|
+| favorite | Choose your favorite color. | string | red |
+
+
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](https://github.com/devcontainers/feature-starter/blob/main/src/color/devcontainer-feature.json).  Add additional notes to a `NOTES.md`._

src/wasm32-unknown-unknown/devcontainer-feature.json

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+{
+    "name": "Rust wasm32_unknown_unknown",
+    "id": "wasm32-unknown-unknown",
+    "version": "0.0.1",
+    "description": "A feature to install wasm32_unknown_unknown",
+    "options": {
+    },
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/rust"
+    ]
+}

src/wasm32-unknown-unknown/install.sh

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+#!/bin/bash
+set -e
+
+if ! (which rustup > /dev/null && which cargo > /dev/null); then
+    which curl > /dev/null || (apt update && apt install curl -y -qq)
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+    source $HOME/.cargo/env
+fi
+
+dpkg -l | grep build-essential || (apt update && apt install build-essential -y -qq)
+
+rustup target add wasm32-unknown-unknown

test/wasm32-unknown-unknown/test.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "version" rustc --print target-list | grep wasm32-unknown-unknown
+
+# Report result
+reportResults