Update build workflows to use image caching, multi-arch, auto-tag #33

Job	Run time
pytest / check-img-cache	28s
pytest / check-img-cache	4s
pytest / check-img-cache	3s
pytest / check-img-cache	3s
pytest / check-img-cache	32s
pytest / backend-test-build	0s
pytest / backend-test-build	0s
pytest / run-pytest	2m 24s
pytest / run-pytest	4m 41s
pytest / run-pytest	4m 30s
pytest / run-pytest	4m 47s
pytest / run-pytest	2m 22s
pytest / backend-test-build / build-image	3m 27s
pytest / backend-test-build / build-image	3m 27s
pytest / backend-test-build / build-image	3m 39s
pytest / backend-test-build / scan-image	0s
pytest / backend-test-build / scan-image	0s
pytest / backend-test-build / scan-image	0s
	30m 27s

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