apt_dpkg: Add basic support for mirror+file: URIs #1109

Job	Run time
integration-tests-installed	3m 19s
linter-tests (debian:testing-slim)	2m 27s
integration-tests (ubuntu:jammy)	4m 13s
skip-tests (ubuntu:jammy)	2m 32s
linter-tests (ubuntu:jammy)	2m 5s
integration-tests (ubuntu:lunar)	4m 19s
skip-tests (ubuntu:lunar)	2m 15s
system-tests (ubuntu:jammy)	6m 49s
linter-tests (ubuntu:lunar)	1m 52s
system-tests (ubuntu:lunar)	8m 37s
system-tests-installed	7m 31s
unit-tests (debian:bookworm-slim)	37s
unit-tests-installed	1m 2s
woke	6s
unit-tests (debian:testing-slim)	41s
unit-tests (ubuntu:jammy)	53s
unit-tests (ubuntu:lunar)	33s
	49m 51s

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