Only include files that are necessary for crates.io #567

Job	Run time
nostd/thumbv6m-none-eabi/stable	18s
miri	11m 5s
cross_test/s390x-unknown-linux-gnu/stable	10m 3s
format/nightly	17s
Pass MSRV values to other jobs	4s
docs/nightly	22s
clippy/stable	26s
cargo-careful	2m 10s
cross_test/i686-unknown-linux-gnu/stable	2m 49s
blas-msrv	1m 13s
tests/1.64.0	3m 42s
tests/stable	2m 42s
tests/beta	2m 41s
tests/nightly	3m 2s
conclusion	2s
	40m 56s

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