Release furble

Add release workflow to generate espwebtool manifest. #17

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Run time

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Job	Run time
build (m5stick-c)	2m 23s
build (m5stick-c-plus)	2m 42s
build (m5stack-core)	2m 32s
build (m5stack-core2)	2m 29s
release	10s
	10m 16s