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>

scripts/init-repo.sh

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+#!/bin/bash
+# Initialize repository and start Happy Coder
+set -e
+
+echo "=== Repository Initialization ==="
+
+# Check if GITHUB_REPO is set
+if [ -z "$GITHUB_REPO" ]; then
+    echo "GITHUB_REPO not set, skipping repository clone"
+    WORKSPACE_DIR="/workspace/default"
+    mkdir -p "$WORKSPACE_DIR"
+else
+    # Parse repo name from URL
+    REPO_NAME=$(basename "$GITHUB_REPO" .git)
+    WORKSPACE_DIR="/workspace/$REPO_NAME"
+
+    echo "Repository: $GITHUB_REPO"
+    echo "Target directory: $WORKSPACE_DIR"
+
+    # Check if repo already exists
+    if [ -d "$WORKSPACE_DIR/.git" ]; then
+        echo "Repository already exists, pulling latest changes..."
+        cd "$WORKSPACE_DIR"
+
+        # Configure git to use token if provided
+        if [ -n "$GITHUB_TOKEN" ]; then
+            git config credential.helper store
+            echo "https://oauth2:${GITHUB_TOKEN}@github.com" > /home/claude/.git-credentials
+            chmod 600 /home/claude/.git-credentials
+        fi
+
+        git pull || echo "Pull failed, continuing anyway..."
+    else
+        echo "Cloning repository..."
+        mkdir -p "$(dirname "$WORKSPACE_DIR")"
+
+        # Clone with token if provided
+        if [ -n "$GITHUB_TOKEN" ]; then
+            # Replace https://github.com/ with https://oauth2:token@github.com/
+            CLONE_URL=$(echo "$GITHUB_REPO" | sed "s|https://github.com/|https://oauth2:${GITHUB_TOKEN}@github.com/|")
+            git clone "$CLONE_URL" "$WORKSPACE_DIR"
+
+            # Configure credentials for future use
+            git config --global credential.helper store
+            echo "https://oauth2:${GITHUB_TOKEN}@github.com" > /home/claude/.git-credentials
+            chmod 600 /home/claude/.git-credentials
+        else
+            git clone "$GITHUB_REPO" "$WORKSPACE_DIR"
+        fi
+    fi
+fi
+
+# Set ownership
+chown -R claude:claude "$WORKSPACE_DIR"
+chown -R claude:claude /home/claude
+
+# Start Happy Coder in background as claude user
+echo "Starting Happy Coder..."
+cd "$WORKSPACE_DIR"
+
+# Create Happy Coder log file
+HAPPY_LOG="/tmp/happy-coder.log"
+touch "$HAPPY_LOG"
+chown claude:claude "$HAPPY_LOG"
+
+# Start Happy Coder as claude user
+sudo -u claude bash -c "cd '$WORKSPACE_DIR' && happy-coder > '$HAPPY_LOG' 2>&1 &"
+
+# Save PID for monitoring
+echo $! > /tmp/happy-coder.pid
+
+echo "Happy Coder started (PID: $(cat /tmp/happy-coder.pid))"
+echo "Logs available at: $HAPPY_LOG"
+
+# Export workspace directory for startapp.sh
+echo "$WORKSPACE_DIR" > /tmp/workspace-dir
+
+echo "=== Initialization Complete ==="

scripts/startapp.sh

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+#!/bin/bash
+# Start application script for baseimage-gui
+set -e
+
+echo "=== Starting Antigravity Dev Container ==="
+
+# Initialize repository and Happy Coder
+/usr/local/bin/init-repo
+
+# Get workspace directory
+if [ -f /tmp/workspace-dir ]; then
+    WORKSPACE_DIR=$(cat /tmp/workspace-dir)
+else
+    WORKSPACE_DIR="/workspace/default"
+fi
+
+echo "Opening Antigravity in: $WORKSPACE_DIR"
+
+# Start Antigravity (VSCode) in the workspace directory as claude user
+# The baseimage-gui will handle the GUI display
+exec sudo -u claude code --new-window --wait "$WORKSPACE_DIR"