feat: initial version

[skunxicat]

feat: Initial Lambda Shell Runtime Release

This PR introduces lambda-shell-runtime - a custom AWS Lambda runtime that enables deploying Bash scripts directly as serverless functions.

✨ Features

• Three optimized variants: tiny (132MB), micro (221MB), full (417MB)
• Built-in tools: jq, curl, http-cli in all variants
• AWS integration: awscurl in micro, full AWS CLI in full variant
• Multi-platform: ARM64 and x86_64 support
• Production ready: Proper error handling and Lambda Runtime API compliance

📊 Performance

Highly competitive with official AWS runtimes:

• 22% smaller than Python (417MB vs 534MB)
• Similar size to Node.js (417MB vs 410MB)
• 75% smaller tiny variant vs official runtimes

🏗️ Architecture

• Base image: Amazon Linux 2023 Lambda base
• Runtime API: Full compliance with AWS Lambda Runtime API
• Error handling: Proper init and invocation error reporting
• Multi-registry: Published to both GHCR and AWS Public ECR

🧪 Usage

FROM public.ecr.aws/j5r7n1v7/lambda-shell-runtime:tiny
COPY handler.sh .

handler.sh

hello() {
    echo '{"message": "Hello from Bash Lambda!"}'
}