Add support for extras in `build-cpio` #2498

Job	Run time
source-date-epoch	2m 11s
build-nginx-all-arches (x86_64)	1m 7s
build-all-examples-amd64 (ubuntu-latest)	2m 1s
build-nginx-all-arches (386)	1m 3s
annotations	1m 32s
build-all-examples-amd64 (macos-latest)	1m 25s
build-date-epoch	2m 8s
build-nginx-all-arches (armv7)	1m 51s
build-nginx-all-arches (aarch64)	1m 12s
build-nginx-multiarch	1m 8s
build-nginx-all-arches (riscv64)	1m 10s
build-nginx-all-arches (s390x)	1m 18s
build-nginx-all-arches (ppc64le)	1m 45s
	19m 51s

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