[M3] Create Loki Install Script

[miciav]

Description

Interactive script to install Loki on controller node.

Files to create

• scripts/install_loki.sh (new)

Features

• Detect OS (macOS vs Ubuntu)
• Prompt for install method:
  • brew install loki (macOS)
  • apt install loki (Ubuntu 24.04+)
  • docker run grafana/loki (cross-platform)
• Create default config file
• Set up systemd service (apt) or launchctl (brew)
• Verify installation

Acceptance criteria

• Works on macOS with Homebrew
• Works on Ubuntu 24.04+
• Docker option functional
• Idempotent (safe to re-run)

Milestone: M3 - Loki Installation Scripts
Issue: 3.1

[miciav]

Loki install script available in scripts/install_loki.sh.