Add Docker SSH server with GitHub Actions CI

[Copilot]

Plan for Docker SSH Server + GitHub Actions CI

• Create Dockerfile to set up SSH server
  • Base image with SSH server support (Ubuntu 22.04)
  • Create user plfanzen with password plfanzy
  • Configure SSH server to accept password authentication
  • Expose SSH port (22)
• Create GitHub Actions workflow
  • Build Docker image
  • Push image to GitHub Container Registry (ghcr.io)
  • Test SSH connectivity with retry mechanism
  • Add explicit permissions for security
  • Fix step ordering for sshpass installation
• Update README with usage instructions and security note
  • Add instructions for using pre-built images from ghcr.io
  • Document available image tags
• Test the implementation locally
• Address code review feedback
  • Remove duplicate PasswordAuthentication configuration
  • Improve CI with retry mechanism for SSH readiness
  • Add security note about hardcoded password
• Run security checks - All passed ✓
• Add GHCR push functionality

Original prompt

Build a simple Docker container + GitHub actions CI. The Docker container should simply spawn an SSH server with username plfanzen and password plfanzy.

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[AaronDewes]

@copilot Make GitHub actions build & push the image to ghcr.io

[Copilot]

@copilot Make GitHub actions build & push the image to ghcr.io

Done! The workflow now builds and pushes the Docker image to ghcr.io with the following features:

• Automatic push to GitHub Container Registry
• Multiple tags: latest, branch-specific, and commit-specific builds
• Updated README with instructions for using pre-built images

Commits: 4a2b795 (add GHCR push) and 1fc0fe5 (fix step order)