Enabled a workflow dispatch to smoke test the release process. Ensuri… #471

Job	Run time
build-macos (1.1)	32s
build-notls	47s
build-ubuntu (ubuntu-latest)	18m 59s
build-macos-openssl-1-0-2 (macos-latest)	2m 24s
build-macos (3.0)	35s
build-ubuntu (ubuntu-20.04)	4m 27s
	27m 44s

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