fix: annotate flags so they complete better (#3444)

cmd/build.go

@@ -81,6 +81,7 @@ When using ` + "`--single-target`" + `, the ` + "`GOOS`" + ` and ` + "`GOARCH`"
 	cmd.Flags().StringArrayVar(&root.opts.ids, "id", nil, "Builds only the specified build ids")
 	cmd.Flags().BoolVar(&root.opts.deprecated, "deprecated", false, "Force print the deprecation message - tests only")
 	cmd.Flags().StringVarP(&root.opts.output, "output", "o", "", "Copy the binary to the path after the build. Only taken into account when using --single-target and a single id (either with --id or if configuration only has one build)")
+	_ = cmd.Flags().SetAnnotation("output", cobra.BashCompFilenameExt, []string{""})
 	_ = cmd.Flags().MarkHidden("deprecated")
 
 	root.cmd = cmd

cmd/release.go

@@ -84,6 +84,7 @@ func newReleaseCmd() *releaseCmd {
 	cmd.Flags().DurationVar(&root.opts.timeout, "timeout", 30*time.Minute, "Timeout to the entire release process")
 	cmd.Flags().BoolVar(&root.opts.deprecated, "deprecated", false, "Force print the deprecation message - tests only")
 	_ = cmd.Flags().MarkHidden("deprecated")
+	_ = cmd.Flags().SetAnnotation("config", cobra.BashCompFilenameExt, []string{"yaml", "yml"})
 
 	root.cmd = cmd
 	return root

cmd/schema.go

@@ -47,7 +47,8 @@ func newSchemaCmd() *schemaCmd {
 		},
 	}
 
-	cmd.Flags().StringVarP(&root.output, "output", "o", "-", "where to save the json schema")
+	cmd.Flags().StringVarP(&root.output, "output", "o", "-", "Where to save the JSONSchema file")
+	_ = cmd.Flags().SetAnnotation("output", cobra.BashCompFilenameExt, []string{"json"})
 
 	root.cmd = cmd
 	return root