Merge pull request #4811 from opensafely-core/check-existing-releases… #129

Job	Run time
test-and-build-docker-image / docker-test	3m 9s
test-and-build-docker-image / check	37s
test-and-build-docker-image / lint-dockerfile	7s
test-and-build-docker-image / test	3m 15s
deploy	2m 45s
	9m 53s

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