ci: update build workflows to use image caching, multi-arch, auto-tag… #437

Job	Run time
frontend-tests / Run Frontend Tests	44s
backend-build / build-image	2m 24s
frontend-main-build / build-image	2m 6s
pytest / check-img-cache	2s
pytest / test-img-build / build-image	4m 26s
frontend-main-build / scan-image	16s
backend-build / scan-image	57s
smoke-test-frontend	6s
smoke-test-backend	4s
deploy-containers	0s
pytest / test-img-build / scan-image	0s
pytest / run-pytest	2m 7s
	13m 12s

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