Test

Add ringbuf_multi example #1998

Job	Run time
Build [features = ['vendored']]	43s
Build for aarch32	1m 26s
Build [features = ['static']]	24s
Build capable example with static libelf and libz	16s
Build for aarch64	1m 19s
Build using minimum versions of dependencies	40s
Check documentation	39s
Run chosen examples	34s
Lint with clippy	28s
Check code formatting	11s
Test [stable, dev]	1m 33s
Test [nightly, dev]	1m 33s
Test [stable, release]	2m 29s
required-checks	1s
	12m 16s

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