chore: release 0.12.0 #17

Job	Run time
Calculate list of debian distros and docker image tags	5s
build_and_test_backend / pylint	31s
build_and_test_backend / mypy	32s
build_and_test_backend / format	23s
build_and_test_backend / test (3.10, ubuntu-latest)	1m 32s
build_and_test_backend / test (3.11, ubuntu-latest)	1m 35s
build_and_test_frontend / format	40s
build_and_test_frontend / test	55s
build_and_test_frontend / build-web	1m 22s
build_and_test_frontend / lint	50s
build_and_test_frontend / build-app	5m 58s
Build .deb packages (debian:bookworm)	3m 42s
Build and publish ready made docker containers	3m 9s
Build .deb packages (debian:trixie)	4m 6s
Build .deb packages (ubuntu:jammy)	4m 17s
Deploy demo application	0s
Attach assets to release	0s
	29m 37s

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