ci: apt-key is deprecated #460

Job	Run time
DEB build (ubuntu-20.04, ubuntu:20.04)	2m 32s
DEB build (ubuntu-22.04, ubuntu:22.04)	3m 5s
DEB build (ubuntu-24.04, ubuntu:24.04)	4m 17s
DEB build (debian-10, debian:buster)	2m 35s
DEB build (debian-11, debian:bullseye)	2m 27s
DEB build (debian-12, debian:bookworm)	3m 2s
DEB build (debian-sid, debian:sid)	3m 7s
DEB install test (ubuntu-20.04, ubuntu:20.04)	28s
DEB install test (ubuntu-22.04, ubuntu:22.04)	25s
DEB install test (ubuntu-24.04, ubuntu:24.04)	25s
DEB install test (debian-10, debian:buster)	31s
DEB install test (debian-11, debian:bullseye)	25s
DEB install test (debian-12, debian:bookworm)	18s
DEB install test (debian-sid, debian:sid)	22s
	23m 59s

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