fix(docker): ship declared example/bench sources in build context #579

Job	Run time
native-backend/stable	8m 0s
Pass MSRV values to other jobs	4s
nostd/thumbv6m-none-eabi/stable	24s
format/stable	21s
clippy/1.95.0	47s
tier4-avx512-check	30s
hpc-stream-parallel/rayon	1m 26s
nightly-simd-polyfill	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
cargo-careful	-1s
miri	-1s
docs/nightly	-1s
blas-msrv	50s
tests/stable	11m 25s
tests/beta	10m 59s
tests/1.95.0	11m 30s
conclusion	0s
	46m 11s

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