Finalize PR #190: Dockerfile and dependency updates

[goniszewski]

Summary

• streamline Dockerfile setup for multi-arch images and re-add user permissions fixes
• update the s6 run script to fix mounted-volume permissions
• keep migrations executed via s6-setuidgid
• update development and runtime dependencies
• remove bun.lockb from version control
• stop ignoring bun.lockb in .gitignore

Testing

• bun run test:unit (fails: fetch failed & expected URL mismatch)

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https://chatgpt.com/codex/tasks/task_b_6851661ca3a4832abdd78444a60685a9

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot

See analysis details on SonarQube Cloud