Handle clone failures #231

Job	Run time
ci / get-rust-version	5s
ci / deny	3m 53s
ci / machete	1m 7s
ci / build (ubuntu-latest, x86_64-unknown-linux-musl, gitopolis-linux-x86_64, gitopolis)	2m 25s
ci / build (macos-latest, x86_64-apple-darwin, gitopolis-macos-x86_64, gitopolis)	1m 11s
ci / build (windows-latest, x86_64-pc-windows-msvc, gitopolis-windows-x86_64, gitopolis.exe)	1m 58s
	10m 39s

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