chore: release 0.12.1 #21

Job	Run time
Calculate list of debian distros and docker image tags	4s
build_and_test_backend / pylint	29s
build_and_test_backend / mypy	31s
build_and_test_backend / test (3.10, ubuntu-latest)	1m 37s
build_and_test_backend / format	22s
build_and_test_backend / test (3.11, ubuntu-latest)	1m 38s
build_and_test_frontend / format	42s
build_and_test_frontend / lint	50s
build_and_test_frontend / test	50s
build_and_test_frontend / build-web	1m 22s
build_and_test_frontend / build-app	6m 29s
Build and publish ready made docker containers	3m 20s
Build .deb packages (debian:bookworm)	3m 29s
Build .deb packages (debian:trixie)	3m 47s
Build .deb packages (ubuntu:jammy)	3m 42s
Deploy demo application	0s
Attach assets to release	0s
	29m 12s

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