Add Docker support

[dcondrey]

Difficulty: Moderate

Create a Dockerfile and docker-compose.yml so users can run the tracker without installing Python.

Considerations:

• Playwright needs Chromium installed in the container (for cookie capture)
• Cookie encryption uses macOS Keychain — needs a fallback for Docker (file-based key or env var)
• SQLite database should be mounted as a volume for persistence
• The cookie capture step (location-tracker cookies) requires a display — consider X11 forwarding or a VNC-based approach

Deliverables:

• `Dockerfile` (multi-stage: build + runtime)
• `docker-compose.yml` with volume mounts
• Updated README with Docker instructions

[akandeadedayo01]

Hello @dcondrey I'm a Senior DevOps Engineer with hands on experience in deploying maps for Spiro Mobility in Africa. Please, I will like to claim this issue.

[dcondrey]

@akandeadedayo01 feel free to submit a pr.