Test

Add ringbuf_multi example #1997

Job	Run time
Build using minimum versions of dependencies	40s
Build [features = ['vendored']]	19s
Build [features = ['static']]	22s
Build for aarch32	42s
Build for aarch64	45s
Build capable example with static libelf and libz	24s
Check documentation	37s
Lint with clippy	32s
Run chosen examples	39s
Check code formatting	11s
Test [stable, dev]	1m 28s
Test [nightly, dev]	1m 24s
Test [stable, release]	2m 17s
required-checks	1s
	10m 21s

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