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docker.sh

docker.sh: Install the Docker Engine on Linux in a safe, idempotent, shell-friendly way

Usage (via loader):
  load.sh docker -- [--help] [--dry-run] [--no-group] [--channel CHANNEL]

Examples:
  # Install Docker with sensible defaults
  load.sh docker
  # Show help
  load.sh docker -- --help
  # Simulate actions without making changes
  load.sh docker -- --dry-run

Description:
- Installs Docker Engine using the official convenience script from get.docker.com
- Creates the "docker" group (if missing) and adds the current user to it (unless --no-group)
- Fixes $HOME/.docker permissions for the current user
- Idempotent: safe to re-run, it will skip already completed steps
- Non-interactive: suitable for CI; prints clear logs and exits on first error
- Supports a dry-run mode for previewing actions

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