cross-rs setup example

cross.toml

[build]

[target.armv7-unknown-linux-musleabihf]
pre-build = [
    "dpkg --add-architecture $CROSS_DEB_ARCH",
    "apt-get update && apt-get install --assume-yes libssl-dev:$CROSS_DEB_ARCH",
    "echo -e '#!/bin/bash\necho test' > /usr/bin/test-echo",
    "chmod +x /usr/bin/test-echo"
]