Ubuntu packaging - PR-10986 (branch beta), by @mcdurdin, testbuild: true #2562

Job	Run time
Build source package	3m 33s
Build binary packages (focal, amd64)	1m 52s
Build binary packages (jammy, amd64)	3m 14s
Build binary packages (mantic, amd64)	3m 18s
Build binary packages (noble, amd64)	3m 25s
Verify API for libkeymancore.so	1m 2s
Run autopkgtests	1s
Sign source and binary packages	0s
Upload packages to llso	0s
Set result status on PR builds	10s
	16m 35s

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