Add Docker support with Dockerfile and docker-compose

[pelle]

Summary

This PR adds comprehensive Docker support to tap-http, making it easier to deploy and run the application in containerized environments. The changes include a multi-stage Dockerfile for efficient builds, a docker-compose configuration for quick local development, and updated documentation.

Key Changes

• Dockerfile: Multi-stage build that compiles tap-http in a Rust builder image and packages it in a minimal Debian runtime image

  • Optimized layer caching by copying Cargo manifests before source code
  • Non-root user (tap) for security
  • Persistent storage at /data/tap for keys, logs, and databases
  • Health check endpoint
  • Includes both tap-http and tap-payment-simulator binaries

• docker-compose.yml: Simple configuration for local development

  • Single service definition with volume mounting for persistent data
  • Port mapping (8000:8000)
  • Environment variables for configuration
  • Auto-restart policy

• .dockerignore: Excludes unnecessary files from the build context

  • Reduces build context size by excluding git, docs, examples, and build artifacts

• README.md: Added comprehensive Docker section with:

  • Quick start guide using docker-compose
  • Manual image build instructions
  • Multiple docker run examples (named volumes, host directories, with CLI flags)
  • Persistent storage documentation with path mappings
  • Environment variable configuration examples
  • Data inspection commands

Notable Implementation Details

• The Dockerfile uses a two-stage build to minimize the final image size
• Pre-builds dependencies in the builder stage for better caching
• Sets TAP_HTTP_HOST=0.0.0.0 to allow external connections in containers
• All configuration is environment-variable driven for flexibility
• Health check uses tap-http --help as a simple liveness probe

https://claude.ai/code/session_01NrmQxebTcQsNZeR2a9FnQn