Continuous integration

Fix needless-return clippy lints and switch to thiserror #307

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Run time

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Job	Run time
Check	2m 49s
Clippy	1m 14s
Build Docker image	0s
End-to-end upload test	5m 23s
Rustfmt	11s
ruff-format	5s
ruff-lint	4s
Test Suite	1m 34s
	11m 20s