Build and publish package

Merge pull request #6 from FlowFuse/ci-add-package-publish-workflow #4

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Run time

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Job	Run time
build / Build on 18	11s
build / Build on 18	11s
build / Build on 18	12s
publish / buildAndPublish	8s
publish / buildAndPublish	7s
publish / buildAndPublish	5s
	54s