ci: fix artifact up / download #23

Job	Run time
Calculate list of debian distros and docker image tags	7s
build_and_test_backend / pylint	32s
build_and_test_backend / test (3.10, ubuntu-latest)	1m 34s
build_and_test_backend / test (3.11, ubuntu-latest)	1m 31s
build_and_test_backend / mypy	32s
build_and_test_backend / format	23s
build_and_test_frontend / lint	50s
build_and_test_frontend / build-app	4m 53s
build_and_test_frontend / format	42s
build_and_test_frontend / build-web	1m 27s
build_and_test_frontend / test	51s
Build and publish ready made docker containers	3m 10s
Build .deb packages (debian:bookworm)	3m 18s
Build .deb packages (debian:trixie)	3m 36s
Build .deb packages (ubuntu:jammy)	3m 34s
Deploy demo application	1s
Attach assets to release	1s
	27m 2s

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