bash completion for `docker manifest ls`

Signed-off-by: Wayne Cheng <zhengwei@tiduyun.com>

contrib/completion/bash/docker

@@ -4140,6 +4140,11 @@ _docker_manifest() {
 		inspect
 		push
 		rm
+		ls
+	"
+
+	local aliases="
+		list
 	"
 	__docker_subcommands "$subcommands" && return
 
@@ -4249,6 +4254,14 @@ _docker_manifest_rm() {
 	esac
 }
 
+_docker_manifest_ls() {
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "--format --help --quiet -q" -- "$cur" ) )
+			;;
+	esac
+}
+
 _docker_node() {
 	local subcommands="
 		demote