Ruby: Add ability to install gem from a branch #1071

Job	Run time
Build x86_64-linux-musl gem	3m 50s
Build default gem	2m 2s
Build x86-linux-musl gem	3m 34s
Build x86-linux-gnu gem	3m 43s
Build arm64-darwin gem	4m 16s
Build arm-linux-musl gem	3m 1s
Build aarch64-linux-gnu gem	3m 10s
Build arm-linux-gnu gem	3m 34s
Build x86_64-darwin gem	4m 26s
Build x86_64-linux-gnu gem	3m 32s
Build aarch64-linux-musl gem	3m 12s
Push gems with trusted publishing	0s
	38m 20s

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