CI for Backend and Frontend #4081

Job	Run time
backend-tests	1m 39s
backend-black	9s
backend-isort	9s
backend-zpretty	13s
classic-black	9s
backend-flake8	8s
classic-flake8	12s
classic-isort	9s
classic-zpretty	9s
frontend-eslint	51s
i18n sync	47s
frontend-prettier	12s
frontend-tests	50s
release (backend, backend, Dockerfile)	1m 15s
release (frontend, frontend, Dockerfile)	4m 24s
release (classic, classic, Dockerfile)	1m 14s
	12m 30s

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