Initial commit: Antigravity dev container with Happy Coder

Add containerized GUI development environment featuring:
- Antigravity IDE (VSCode) accessible via web browser
- Happy Coder AI assistant integration
- Automatic GitHub repository cloning on startup
- Persistent user home directory (ReadWriteMany PVC)
- Secure non-root execution as user claude (UID 1000)

Components:
- Dockerfile based on jlesage/baseimage-gui
- Startup scripts for repo initialization and app launch
- Kubernetes manifests (StatefulSet, ConfigMap, Secrets)
- Makefile for build and deployment automation
- Comprehensive documentation

Features:
- Web-based VNC interface (port 5800)
- GitHub token authentication for private repos
- Happy Coder runs as background service in workspace
- CephFS storage for persistent home directory
- Configurable display resolution and security

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

Dockerfile

@@ -0,0 +1,76 @@
+FROM jlesage/baseimage-gui:ubuntu-22.04-v4
+
+# Set environment variables
+ENV APP_NAME="Antigravity Dev Container" \
+    KEEP_APP_RUNNING=1 \
+    DISPLAY_WIDTH=1920 \
+    DISPLAY_HEIGHT=1080 \
+    SECURE_CONNECTION=1 \
+    USER_ID=1000 \
+    GROUP_ID=1000 \
+    CLAUDE_USER=claude
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    wget \
+    gnupg \
+    ca-certificates \
+    git \
+    build-essential \
+    python3 \
+    python3-pip \
+    jq \
+    unzip \
+    sudo \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Chrome
+RUN wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | gpg --dearmor -o /usr/share/keyrings/google-chrome-keyring.gpg && \
+    echo "deb [arch=amd64 signed-by=/usr/share/keyrings/google-chrome-keyring.gpg] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list && \
+    apt-get update && \
+    apt-get install -y google-chrome-stable && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Node.js (LTS version for Happy Coder)
+RUN curl -fsSL https://deb.nodesource.com/setup_lts.x | bash - && \
+    apt-get install -y nodejs && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Happy Coder globally
+RUN npm install -g @happy-sdk/happy-coder
+
+# Install Antigravity (Google's Project IDX / Cloud Code alternative)
+# Note: Antigravity might be packaged differently - adjust as needed
+# For now, we'll use VSCode with Project IDX extensions as a placeholder
+RUN wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor -o /usr/share/keyrings/packages.microsoft.gpg && \
+    echo "deb [arch=amd64 signed-by=/usr/share/keyrings/packages.microsoft.gpg] https://packages.microsoft.com/repos/code stable main" > /etc/apt/sources.list.d/vscode.list && \
+    apt-get update && \
+    apt-get install -y code && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create claude user with specific UID/GID
+RUN groupadd -g 1000 claude && \
+    useradd -u 1000 -g 1000 -m -s /bin/bash claude && \
+    echo "claude ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+# Create workspace directory
+RUN mkdir -p /workspace && \
+    chown -R claude:claude /workspace
+
+# Copy startup script
+COPY --chmod=755 scripts/startapp.sh /startapp.sh
+COPY --chmod=755 scripts/init-repo.sh /usr/local/bin/init-repo
+
+# Set working directory
+WORKDIR /workspace
+
+# Configure container to run as claude user
+ENV HOME=/home/claude \
+    USER=claude
+
+# Expose VNC port (baseimage-gui default)
+EXPOSE 5800
+
+# Set app name for baseimage-gui
+RUN set-cont-env APP_NAME "Antigravity"