WARNING: ssh-add -K ( The -K and -A flags are deprecated in install.sh)

[b-fa-ce]

Running zsh install.sh results in the following warning:

WARNING: The -K and -A flags are deprecated and have been replaced
         by the --apple-use-keychain and --apple-load-keychain
         flags, respectively.  To suppress this warning, set the
         environment variable APPLE_SSH_ADD_BEHAVIOR as described in
         the ssh-add(1) manual page.

This stems from:

# Symlink SSH config file to the present `config` file for macOS and add SSH passphrase to the keychain
if [[ `uname` =~ "Darwin" ]]; then
  target=~/.ssh/config
  backup $target
  symlink $PWD/config $target
  ssh-add -K ~/.ssh/id_ed25519
fi

in install.sh and should maybe be updated?