Change Rust install location

By default, Rust will be installed to home directory: ~/.cargo and ~/.rustup. To change the location,

• Set CARGO_HOME and RUSTUP_HOME environment variable before installation
• Install Rust using rust-init
• Update PATH environment variable to install $CARGO_HOME/bin

see also

• Overriding Rust installation default paths `$HOME/.cargo` and `$HOME/.rustup`