zsh: Source zsh alias file if it exists

terminal/.config/zsh/.zshrc

@@ -81,6 +81,8 @@ if [ -d "$CONFDIR/sh/alias.d" ]; then
     done
     unset _alias
 fi
+# shellcheck source=alias
+[ -f "$ZSHCONFDIR/alias" ] && source "$ZSHCONFDIR/alias"
 if [ -d "$ZSHCONFDIR/alias.d" ]; then
     for _alias in "$ZSHCONFDIR/alias.d"/*.sh; do
         source "$_alias"