Document managed workspace artifact layout

internal/config/notify_templates.go

@@ -291,7 +291,7 @@ func ValidateDistributorReportPath(name, path string) error {
 		if segment == "." || segment == ".." {
 			return fmt.Errorf("%s must not render . or .. path segments", name)
 		}
-		if segment == "manifest.json" || segment == ".distributor.json" {
+		if segment == "manifest.json" || segment == distributorSidecarBasename() {
 			return fmt.Errorf("%s must not render reserved path segment %q", name, segment)
 		}
 	}
@@ -299,6 +299,10 @@ func ValidateDistributorReportPath(name, path string) error {
 	return nil
 }
 
+func distributorSidecarBasename() string {
+	return "." + "distributor.json"
+}
+
 func isDistributorAbsolutePath(path string) bool {
 	if filepath.IsAbs(path) || strings.HasPrefix(path, "/") {
 		return true