compose: Support buildah too #3172

Job	Run time
Build	16m 24s
cargo-deny	22s
Build (c9s)	20m 37s
Build Integration Test Data	1m 0s
Verify CXX generation	1m 41s
Differential ShellCheck	17s
Container Integration	3m 10s
Compose tests	28m 35s
compose-rootfs tests	1m 16s
compose-image tests	13m 35s
Container build	4m 25s
Encapsulate tests	2m 29s
experimental build-chunked-oci tests	3m 47s
	1h 37m 38s

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