feat: add antigravity-nix devcontainer feature

Author: duizendstra

.github/workflows/release.yaml

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+name: "Release Dev Container Features"
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: "Publish Features"
+        uses: devcontainers/action@v1
+        with:
+          publish-features: "true"
+          base-path-to-features: "./src"
+          generate-docs: "true"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md

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+# Devcontainer Features
+
+Custom devcontainer features for Antigravity IDE development environments.
+
+## Features
+
+### `antigravity-nix`
+
+A consolidated feature that provides:
+- **vscode user** (uid/gid 1000) with passwordless sudo
+- **Nix package manager** (single-user mode with flakes enabled)
+- **Essential tools**: wget, git, curl, sudo, ca-certificates
+
+#### Usage
+
+```json
+{
+  "features": {
+    "ghcr.io/duizendstra/devcontainer-features/antigravity-nix:1": {}
+  }
+}
+```
+
+## Publishing
+
+Features are automatically published to `ghcr.io/duizendstra/devcontainer-features/` when pushed to main.
+
+## Development
+
+To test features locally, use the dev container CLI:
+
+```bash
+devcontainer features test -f antigravity-nix
+```

src/antigravity-nix/devcontainer-feature.json

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+{
+    "id": "antigravity-nix",
+    "version": "1.0.0",
+    "name": "Antigravity Nix",
+    "description": "Consolidated devcontainer feature: creates vscode user, installs Nix with flakes, and essential tools (wget, git, curl, sudo) for Antigravity IDE",
+    "options": {},
+    "containerEnv": {
+        "NIX_CONF_DIR": "/etc/nix"
+    }
+}

src/antigravity-nix/install.sh

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+#!/bin/bash
+set -e
+
+echo "=== Antigravity Nix Feature ==="
+
+# --- 1. Install essential packages ---
+echo "Installing essential packages..."
+apt-get update
+apt-get install -y --no-install-recommends \
+    sudo \
+    git \
+    wget \
+    curl \
+    ca-certificates \
+    xz-utils \
+    gnupg
+rm -rf /var/lib/apt/lists/*
+
+# --- 2. Create vscode user ---
+echo "Creating vscode user..."
+if ! id -u vscode > /dev/null 2>&1; then
+    groupadd -g 1000 vscode
+    useradd -u 1000 -g 1000 -m -s /bin/bash vscode
+fi
+echo "vscode ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/vscode
+chmod 0440 /etc/sudoers.d/vscode
+
+# --- 3. Pre-create /nix with correct ownership ---
+echo "Setting up /nix directory..."
+mkdir -p /nix
+chown 1000:1000 /nix
+
+# --- 4. Install Nix (single-user mode as vscode) ---
+echo "Installing Nix..."
+su - vscode -c 'curl -L https://nixos.org/nix/install | sh -s -- --no-daemon'
+
+# --- 5. Configure Nix for flakes ---
+echo "Configuring Nix for flakes..."
+mkdir -p /etc/nix
+cat > /etc/nix/nix.conf << 'EOF'
+experimental-features = nix-command flakes
+build-users-group =
+EOF
+
+# --- 6. Add Nix to profile for all shells ---
+echo "Adding Nix to shell profile..."
+cat >> /etc/profile.d/nix.sh << 'EOF'
+if [ -e '/home/vscode/.nix-profile/etc/profile.d/nix.sh' ]; then
+  . '/home/vscode/.nix-profile/etc/profile.d/nix.sh'
+fi
+EOF
+
+cat >> /etc/bash.bashrc << 'EOF'
+if [ -e '/home/vscode/.nix-profile/etc/profile.d/nix.sh' ]; then
+  . '/home/vscode/.nix-profile/etc/profile.d/nix.sh'
+fi
+EOF
+
+echo "=== Antigravity Nix Feature Complete ==="