Add logging for container instances

[JimMadge]

✅ Checklist

• You have given your pull request a meaningful title (e.g. Enable foobar integration rather than 515 foobar).
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🚦 Depends on

⤴️ Summary

🌂 Related issues

Contributes to #1922

🔬 Tests

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
data_safe_haven/infrastructure/programs
declarative_sre.py					213
data_safe_haven/infrastructure/programs/sre
apt_proxy_server.py					39
clamav_mirror.py					36
gitea_server.py					60
hedgedoc_server.py					63
identity.py					45
remote_desktop.py					70
software_repositories.py					44
user_services.py					63
Project Total

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