ci: small fixes #10

Job	Run time
Calculate list of debian distros and docker image tags	4s
build_and_test_frontend / build-web	1m 30s
build_and_test_frontend / build-app	5m 14s
build_and_test_frontend / format	45s
build_and_test_frontend / lint	1m 12s
build_and_test_frontend / test	51s
build_and_test_backend / format	23s
build_and_test_backend / mypy	29s
build_and_test_backend / test (3.10, ubuntu-latest)	1m 37s
build_and_test_backend / pylint	31s
build_and_test_backend / test (3.11, ubuntu-latest)	1m 31s
Build .deb packages (debian:bookworm)	4m 1s
Build and publish ready made docker containers	2m 31s
Deploy demo application	24s
Attach assets to release	0s
	21m 3s

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