CI for Backend and Frontend #3388

Job	Run time
backend-black	10s
backend-isort	10s
backend-tests	1m 51s
backend-zpretty	23s
classic-black	16s
classic-flake8	15s
backend-flake8	14s
classic-isort	12s
classic-zpretty	12s
frontend-eslint	1m 0s
i18n sync	51s
frontend-prettier	15s
frontend-tests	53s
release (backend, backend, Dockerfile)	5m 15s
release (frontend, frontend, Dockerfile)	5m 36s
release (classic, classic, Dockerfile)	5m 25s
	22m 58s

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