install: Add `print-configuration` #678

Job	Run time
Build skopeo git main for ubuntu	1m 41s
build-c9s	2m 52s
build-fedora	3m 59s
cargo-deny	21s
tests	4m 40s
Test install-alongside	1m 0s
Privileged testing	30s
Container testing	2m 26s
	17m 29s

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