feat: Add disk usage percentage and warn on high usage #141

Job	Run time
Run Rustfmt	14s
Run Clippy	43s
Run RustDoc	3m 43s
Run Cargo Udeps	1m 15s
Run Cargo Deny (bans licenses sources)	38s
Run Cargo Deny (advisories)	38s
Run Cargo Tests	19s
All tests passed	4s
	7m 34s

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