cargo backup

backup and restore $CARGOHOME cache to cargobak.zip cargo restore for custom docker ci

list of backup directories: shell $CARGO_HOME/registry/index/ $CARGO_HOME/registry/cache/ $CARGO_HOME/git/db/

usage:

• backup shell cargo-bak bak cargo-bak bak -s [filename]

• backup zip compression level default 0

• change compression level use -c shell cargo-bak bak -c 6

• restore shell cargo-bak restore ./cargo_bak.zip