zsh completion: add --password-stdin
@@ -2761,6 +2761,7 @@ __docker_subcommand() {
_arguments $(__docker_arguments) -A '-*' \
$opts_help \
"($help -p --password)"{-p=,--password=}"[Password]:password: " \
+ "($help)--password-stdin[Read password from stdin]" \
"($help -u --user)"{-u=,--user=}"[Username]:username: " \
"($help -)1:server: " && ret=0
;;
