scylla_repository: setup: allow debug in version string #102

Job	Run time
CCM Integration tests (using Nix) / build	27m 33s
CCM Integration tests / build (3.8)	14m 35s
CCM Integration tests / build (3.11)	12m 27s
CCM Integration tests / build (3.12)	12m 55s
	1h 7m 30s

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