Для Fedora Rawhide запустите от имени root:
dnf config-manager --add-repo https://download.opensuse.org/repositories/home:ignatenkobrain:rust/Fedora_Rawhide/home:ignatenkobrain:rust.repo
dnf install rust-starship
Для Fedora 32 запустите от имени root:
dnf config-manager --add-repo https://download.opensuse.org/repositories/home:ignatenkobrain:rust/Fedora_32/home:ignatenkobrain:rust.repo
dnf install rust-starship
Для Fedora 31 запустите от имени root:
dnf config-manager --add-repo https://download.opensuse.org/repositories/home:ignatenkobrain:rust/Fedora_31/home:ignatenkobrain:rust.repo
dnf install rust-starship