fix(shell): fixed zsh/bash config loading

scripts/install-cargo-packages.sh

@@ -2,7 +2,6 @@
 # Install cargo/rust packages.
 #
 # shellcheck source=shared.sh
-DOTFILES_SHARED_LOADED=""
 source "$HOME/.dotfiles/scripts/shared.sh"
 
 ! have cargo && {
@@ -10,6 +9,8 @@ source "$HOME/.dotfiles/scripts/shared.sh"
   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --no-modify-path
 }
 
+source "$CARGO_HOME/env"
+
 packages=(
   # a subprocess caching utility
   "bkt"