Merge pull request #1727 from crazy-max/cmd-completion

cli: add shell completion

commands/build.go

@@ -416,6 +416,9 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 			}
 			return runBuild(dockerCli, options)
 		},
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			return nil, cobra.ShellCompDirectiveFilterDirs
+		},
 	}
 
 	var platformsDefault []string