Ruby: Add ability to install gem from a branch #1066

Job	Run time
Build aarch64-linux-gnu gem	3m 53s
Build x86_64-linux-musl gem	3m 20s
Build x86_64-darwin gem	4m 26s
Build arm-linux-musl gem	3m 23s
Build x86-linux-musl gem	4m 18s
Build aarch64-linux-musl gem	4m 39s
Build arm-linux-gnu gem	3m 32s
Build x86-linux-gnu gem	3m 32s
Build x86_64-linux-gnu gem	4m 22s
Build default gem	2m 7s
Build arm64-darwin gem	4m 8s
Push gems with trusted publishing	0s
	41m 40s

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