Add Mise Runtime Version Manager Feature

src/mise/NOTE.md

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+## Using Mise in your Dev Container
+
+After installing Mise, you can manage language versions by adding a `.mise.toml` file to your project root:
+
+```toml
+[tools]
+node = "20"
+python = "3.11"
+```
+
+Or use the CLI to install tools:
+
+```bash
+mise install node@20
+mise install [email protected]
+```
+
+For more information on using Mise, see the [official documentation](https://mise.jdx.dev/).
+
+## OS Support
+
+This Feature should work on recent versions of Debian/Ubuntu, RedHat Enterprise Linux, Fedora, and Alpine Linux distributions with the `apt`, `yum` or `dnf` package manager installed.
+
+`bash` is required to execute the `install.sh` script.

src/mise/devcontainer-feature.json

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+{
+  "id": "mise",
+  "version": "1.0.0",
+  "name": "Mise (formerly RTX)",
+  "documentationURL": "https://github.com/devcontainers/features/tree/main/src/mise",
+  "description": "Installs Mise, the unified runtime version manager (formerly RTX). Mise works like asdf, rvm, nvm, pyenv, etc - but is a single unified tool for managing all your runtimes.",
+  "options": {
+      "version": {
+          "type": "string",
+          "proposals": [
+              "latest",
+              "none",
+              "v2025.5.0",
+              "v2025.4.12",
+              "v2025.4.11",
+              "v2025.4.10"
+          ],
+          "default": "latest",
+          "description": "Select or enter a Mise version to install"
+      },
+      "installPlugins": {
+          "type": "string",
+          "default": "",
+          "description": "Comma separated list of Mise plugins to install (e.g., 'node,python,ruby')"
+      }
+  },
+  "customizations": {
+      "vscode": {
+          "settings": {
+              "github.copilot.chat.codeGeneration.instructions": [
+                  {
+                      "text": "This dev container includes Mise (formerly RTX), a unified runtime version manager pre-installed and available on the `PATH`. Mise allows you to manage multiple programming language versions (similar to asdf, nvm, pyenv, etc.) with a single tool."
+                  }
+              ]
+          }
+      }
+  },
+  "installsAfter": [
+      "ghcr.io/devcontainers/features/common-utils"
+  ]
+}

src/mise/install.sh

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+#!/usr/bin/env bash
+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+#
+# Docs: https://github.com/devcontainers/features/tree/main/src/mise
+# Maintainer: The Dev Container spec maintainers
+
+set -eux
+
+# Feature options
+MISE_VERSION="${VERSION}"
+INSTALL_PLUGINS="${INSTALLPLUGINS:-""}"
+
+# Install dependencies based on OS
+. /etc/os-release
+
+echo "(*) Installing dependencies for ${ID}..."
+if [ "${ID}" = "debian" ] || [ "${ID}" = "ubuntu" ]; then
+    apt-get update
+    apt-get install -y curl ca-certificates
+elif [ "${ID}" = "fedora" ] || [ "${ID}" = "rhel" ] || [ "${ID}" = "centos" ] || [ "${ID}" = "rocky" ] || [ "${ID}" = "almalinux" ]; then
+    if command -v dnf >/dev/null; then
+        dnf install -y curl
+    else
+        yum install -y curl
+    fi
+fi
+
+# Install mise using the appropriate method for the OS
+if [ "${MISE_VERSION}" != "none" ]; then
+    echo "(*) Installing mise version ${MISE_VERSION}..."
+
+    export MISE_INSTALL_PATH="/usr/local/bin/mise"
+    if [ "${MISE_VERSION:-latest}" = "latest" ]; then
+      # latest: installer’s default, so don’t set MISE_VERSION
+      curl -sSf https://mise.run | sh
+    else
+      # pinned: pass through MISE_VERSION
+      curl -sSf https://mise.run | MISE_VERSION="${MISE_VERSION}" sh
+    fi
+
+    # Verify mise is installed
+    if command -v mise >/dev/null 2>&1; then
+        echo "mise installed successfully: $(mise --version)"
+    else
+        echo "ERROR: mise installation failed. Could not find mise in PATH."
+        exit 1
+    fi
+
+    # Install plugins if specified
+    if [ -n "${INSTALL_PLUGINS}" ]; then
+        echo "Installing mise plugins: ${INSTALL_PLUGINS}"
+        IFS=","
+        read -ra plugins <<< "${INSTALL_PLUGINS}"
+        for plugin in "${plugins[@]}"; do
+            echo "Installing plugin: ${plugin}"
+            mise plugins install ${plugin}
+        done
+    fi
+else
+    echo "Skipping mise installation as 'none' was specified."
+fi
+
+echo "Done!"

test/mise/debian.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "mise version" mise --version
+
+# Check for correct Debian paths
+check "mise in PATH" bash -c "which mise | grep '/usr/local/bin/mise\\|/usr/bin/mise'"
+
+# Report result
+reportResults

test/mise/fedora.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "mise version" mise --version
+
+# Print out where mise actually lives
+echo "DEBUG: mise resolved to: $(command -v mise)"
+
+# Check for correct Fedora paths
+check "mise in PATH" bash -c "command -v mise | grep '/usr/local/bin/mise'"
+
+# Report result
+reportResults

test/mise/install_specific_version.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Check we have the expected version of mise
+check "mise version v2024.5.17" bash -c "mise --version | grep '2024.5.17'"
+
+# Report result
+reportResults

test/mise/install_with_plugins.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Check for mise
+check "mise version" mise --version
+
+# Check for plugins
+check "yarn plugin installed" bash -c "mise plugins list | grep yarn"
+check "redis plugin installed" bash -c "mise plugins list | grep redis"
+
+# Report result
+reportResults

test/mise/rhel.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+# Print out where mise actually lives
+echo "DEBUG: mise resolved to: $(which mise)"
+
+# Definition specific tests
+check "mise version" mise --version
+
+# Check for correct RHEL paths
+check "mise in PATH" bash -c "command -v mise | grep '/usr/local/bin/mise'"
+
+# Report result
+reportResults

test/mise/scenarios.json

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+{
+  "install_specific_version": {
+    "image": "ubuntu:focal",
+    "features": {
+      "mise": {
+        "version": "v2024.5.17"
+      }
+    }
+  },
+  "install_with_plugins": {
+    "image": "ubuntu:focal",
+    "features": {
+      "mise": {
+        "installPlugins": "yarn,redis"
+      }
+    }
+  },
+  "rhel": {
+    "image": "almalinux:8",
+    "features": {
+      "mise": {}
+    }
+  },
+  "debian": {
+    "image": "debian:bullseye",
+    "features": {
+      "mise": {}
+    }
+  },
+  "fedora": {
+    "image": "fedora:latest",
+    "features": {
+      "mise": {}
+    }
+  }
+}

test/mise/test.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "mise version" mise --version
+check "mise activate command" mise activate bash
+check "mise plugins command" mise plugins list
+
+# Report result
+reportResults