Adds Miri to CI/CD (#1446) #329

Job	Run time
docs/stable	20s
clippy/stable	18s
cross_test/s390x-unknown-linux-gnu/stable	6m 0s
cargo-careful	2m 23s
cross_test/i686-unknown-linux-gnu/stable	1m 29s
format/nightly	14s
miri	7m 36s
nostd/thumbv6m-none-eabi/stable	16s
tests/stable	2m 46s
tests/beta	3m 4s
tests/nightly	3m 45s
tests/1.64.0	4m 25s
conclusion	1s
	32m 37s

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