Only include files that are necessary for crates.io #561

Job	Run time
Pass MSRV values to other jobs	2s
clippy/stable	25s
format/nightly	13s
nostd/thumbv6m-none-eabi/stable	17s
miri	10m 58s
cross_test/s390x-unknown-linux-gnu/stable	7m 36s
cargo-careful	2m 3s
cross_test/i686-unknown-linux-gnu/stable	2m 47s
docs/nightly	20s
blas-msrv	56s
tests/nightly	3m 21s
tests/1.64.0	7m 6s
tests/beta	2m 48s
tests/stable	2m 45s
conclusion	2s
	41m 39s

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