Assemble with optimizations, so run doesn't rebuild

[cuviper]

The assemble scripts were using plain cargo build, which only produces target/debug/ binaries. Then when the run scripts used cargo run --release, Cargo had to build target/release/ binaries first. The assembled debug build was a waste.

The simple solution is to assemble with cargo build --release.

[nak3]

It makes every build time longer, but there seems to be no choice but to add --release to cargo build. Runtime performance is more important build time, so I agree this idea.

[0xmichalis]

/lgtm