Add bun devcontainer feature (#13)

Author: shokkunrf

features/src/bun/README.md

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+# Bun (bun)
+
+Installs [Bun](https://bun.com/) JavaScript runtime via the official installer.
+
+## Usage
+
+```json
+"features": {
+    "ghcr.io/shokkunrf/devcontainer-features/bun": {}
+}
+```
+
+## Requirements
+
+- `curl` or `wget` must be available in the container
+- `bash` must be available in the container

features/src/bun/devcontainer-feature.json

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+{
+  "id": "bun",
+  "version": "1.0.0",
+  "name": "Bun",
+  "documentationURL": "https://github.com/shokkunrf/devcontainer/tree/develop/features/src/bun/README.md",
+  "description": "Installs Bun JavaScript runtime via the official installer",
+  "options": {},
+  "installsAfter": ["ghcr.io/devcontainers/features/common-utils"]
+}

features/src/bun/install.sh

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+#!/bin/bash
+# References:
+#   - https://bun.com/docs/installation
+
+set -eu
+
+echo "Activating feature 'bun'"
+
+_install_bun() {
+    if command -v curl >/dev/null; then
+        download_cmd="curl -fsSL https://bun.com/install"
+    elif command -v wget >/dev/null; then
+        download_cmd="wget -qO- https://bun.com/install"
+    else
+        echo "ERROR: curl or wget is required but neither was found!"
+        return 1
+    fi
+
+    # Install as remote user if running as root with non-root remote user
+    if [ "$(id -u)" = "0" ] && [ -n "${_REMOTE_USER:-}" ] && [ "$_REMOTE_USER" != "root" ]; then
+        su - "$_REMOTE_USER" -c "$download_cmd | bash"
+    else
+        $download_cmd | bash
+    fi
+}
+
+_install_bun
+
+echo "Bun installed successfully!"

features/test/bun/devcontainer-base-debian.sh

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+test.sh

features/test/bun/devcontainer-base-ubuntu-remote-user.sh

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+test.sh

features/test/bun/devcontainer-base-ubuntu-root.sh

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+test.sh

features/test/bun/official-debian.sh

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+test.sh

features/test/bun/scenarios.json

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+{
+  "official-debian": {
+    "image": "debian:trixie",
+    "features": {
+      "ghcr.io/devcontainers/features/common-utils:2": {},
+      "bun": {}
+    }
+  },
+  "devcontainer-base-debian": {
+    "image": "mcr.microsoft.com/devcontainers/base:debian",
+    "features": {
+      "bun": {}
+    },
+    "remoteUser": "vscode"
+  },
+  "devcontainer-base-ubuntu-root": {
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+      "bun": {}
+    }
+  },
+  "devcontainer-base-ubuntu-remote-user": {
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+      "bun": {}
+    },
+    "remoteUser": "vscode"
+  }
+}

features/test/bun/test.sh

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+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "bun is installed" bun --version
+check "bun is upgradable" bun upgrade
+
+# Report result
+reportResults