Modernize Docker infrastructure with Alpine 3.20 and CI/CD automation

[Petrus79]

Pull Request: Configurable Docker Build System with Alpine 3.20

Summary

This PR modernizes the Dockerfiles and adds a configuration system for building Docker images. It introduces:

• Alpine 3.20 (from 3.17)
• Python virtual environment (production best practice)
• Configurable repositories via docker.config
• GitHub Actions CI/CD workflow for automated multi-architecture builds
• Updated dependencies with pinned versions

What Changed

New Files

• docker.config - Configuration file for pyHPSU repo and Docker Hub registry
• docker.config.example - Template documentation
• .github/workflows/Push-Docker-Images.yml - Automated CI/CD workflow
• CONFIGURATION.md - User guide

Modified Dockerfiles (all three architectures)

Change	Reason
Alpine 3.17 → 3.20	Security patches, latest stable
System pip → venv	Production standard, better isolation
Hardcoded URLs → Build args	Easy customization
Removed QEMU binaries	Modern buildx handles this
Updated packages	Newer versions, better compatibility

Key Package Updates:

python-can: 4.1.0 → 4.6.1
paho-mqtt: 1.6.1 → 2.1.0
requests: 2.28.1 → 2.32.5
influxdb: 5.3.1 → 5.3.2

New GitHub Actions Workflow

• Automatic builds on every push to main
• Parallel builds for all 3 architectures
• Configuration-driven (reads docker.config)
• Auto-push to Docker Hub

Setup Instructions

1. Add GitHub Secrets (Required)

Go to Repository Settings → Secrets and variables → Actions

Add these two secrets:

• DOCKER_USERNAME = your Docker Hub username
• DOCKER_HUB = your Docker Hub personal access token

2. Configure Repository (Optional)

Edit docker.config if you need custom repositories:

PYHPSU_REPO=https://github.com/your-fork/pyHPSUmqtt.git
DOCKER_HUB_REPO=your-username/pyhpsu_mqtt

3. That's It!

Push to main branch and GitHub Actions will:

• Build all three architectures
• Push to Docker Hub automatically

Detailed Documentation

• User Guide: See CONFIGURATION.md
• Local Development: See CONFIGURATION.md → Advanced section

Testing Checklist

• GitHub Secrets are configured
• Push to main branch
• Verify workflow runs in Actions tab
• Check Docker Hub for new images

Backward Compatibility

✅ Fully compatible - default config uses original repository URLs