Build & publish TM backend container image

Merge pull request #6374 from spwoodcock/ci/gh-workflow-img-build #253

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Run time

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Job	Run time
backend-build / build-image	1m 54s
backend-build / build-image	2m 0s
backend-build / scan-image	0s
backend-build / scan-image	29s
	4m 23s