Adds Miri to CI/CD #323

Job	Run time
cargo-careful	2m 17s
cross_test/s390x-unknown-linux-gnu/stable	5m 7s
clippy/stable	29s
cross_test/i686-unknown-linux-gnu/stable	1m 38s
format/nightly	18s
miri	1h 2m 49s
nostd/thumbv6m-none-eabi/stable	19s
tests/stable	2m 49s
docs/stable	23s
tests/beta	3m 7s
tests/nightly	3m 45s
tests/1.64.0	4m 19s
conclusion	1s
	1h 27m 21s

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