Add support for mmdebstrap's --extract-hook option #195

Job	Run time
unittest (debian:bullseye-slim)	32s
yamllint	14s
unittest (debian:bookworm-slim)	30s
system-testing (debian:unstable-slim)	4m 13s
install (debian:bullseye-slim)	14s
unittest (debian:testing-slim)	31s
system-testing (ubuntu:jammy)	3m 58s
install (debian:bookworm-slim)	13s
unittest (debian:unstable-slim)	35s
system-testing (ubuntu:lunar)	3m 38s
install (debian:testing-slim)	13s
unittest (ubuntu:jammy)	39s
system-testing (ubuntu:mantic)	3m 42s
install (ubuntu:jammy)	14s
unittest (ubuntu:lunar)	32s
install (ubuntu:lunar)	14s
unittest (ubuntu:mantic)	29s
install (ubuntu:mantic)	16s
	20m 57s

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