dependencies stage issue

[f2calv]

With Dockerfile having cargo fetch --target $TARGET we get a working build;
docker run --pull always --rm -it ghcr.io/f2calv/multi-arch-container-rust:0.1.3

With Dockerfile having cargo build --release --target $TARGET we get a non-working build (the default 'hello world' app);
docker run --pull always --rm -it ghcr.io/f2calv/multi-arch-container-rust:0.1.5

What am I missing?

multi-arch-container-rust/Dockerfile

Line 46 in 247433b

fi \

Note: If we remain with 'fetch' we can remove all the above exports from this section, else we can move the 'exports' into external script due to repetition?