Build release artifacts

Test EPUB after building docs #202

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Run time

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Job	Run time
verify-input	11s
build-source	1m 11s
build-docs	5m 9s
build-android (aarch64)	4m 49s
build-android (x86_64)	20m 54s
test-source	9m 45s
test-docs	34s
	42m 33s