Ruby: Add ability to install gem from a branch (#1337) #1075

Job	Run time
Build arm-linux-musl gem	3m 25s
Build x86_64-linux-gnu gem	3m 22s
Build default gem	2m 11s
Build aarch64-linux-musl gem	3m 19s
Build aarch64-linux-gnu gem	3m 47s
Build arm-linux-gnu gem	3m 30s
Build x86-linux-gnu gem	3m 21s
Build arm64-darwin gem	3m 30s
Build x86_64-darwin gem	4m 13s
Build x86_64-linux-musl gem	3m 0s
Build x86-linux-musl gem	3m 23s
Push gems with trusted publishing	0s
	37m 1s

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