compose: Allow missing `repos` key and add `--source-root` flag #2858

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Run time

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Job	Run time
Build	52s
Build Integration Test Data	58s
Build (c9s)	13m 53s
Build (clang)	15m 52s
cargo-deny	27s
Verify CXX generation	1m 27s
Differential ShellCheck	15s
Compose tests	0s
Encapsulate tests	0s
Container build	0s
compose-image tests	0s
Container Integration	0s
	33m 44s