Reduce storage costs

[jemrobinson]

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:vertical_traffic_light: Depends on

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:arrow_heading_up: Summary

Reduce storage costs by changing storage SKUs and quotas

• Reduce /home and /shared to the minimum size (100GiB)
• Add a config option to set the quota for /home and /shared
• Move config file share to transaction-optimised storage

:closed_umbrella: Related issues

Progress towards #2124

:microscope: Tests

Test details below:

TL;DR: This change reduces daily costs for an idle SRE from ~£70 to ~£45 an ~35% decrease.

Wednesday August 14th (before changes made)

Daily(!) cost summary of all SHMs/SREs

Resources in sre-coral costing more than £1.50 per day:

Sunday August 18th

Note: this is a day when none of the SREs are being used: variations in costs will be due to different VM sizes/database deployments

• User data is at ~10% of a comparable SRE
• Config data is at ~15% of a comparable SRE

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
data_safe_haven/config
config_sections.py
shm_config.py					30
data_safe_haven/infrastructure/programs/sre
data.py					84-85
data_safe_haven/serialisers
yaml_serialisable_model.py
data_safe_haven/types
annotated_types.py
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