Add tool_tag arg to user_build.py

PiperOrigin-RevId: 215767268
diff --git a/src/TulsiGenerator/Scripts/user_build.py b/src/TulsiGenerator/Scripts/user_build.py
index 01b201c..7aa1d54 100755
--- a/src/TulsiGenerator/Scripts/user_build.py
+++ b/src/TulsiGenerator/Scripts/user_build.py
@@ -48,6 +48,7 @@
   command.extend(flags)
   if xcode_version:
     command.append('--xcode_version=%s' % xcode_version)
+  command.append('--tool_tag=tulsi:user_build')
   command.extend(targets)
 
   return command
diff --git a/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift b/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
index 008a0b0..1f44653 100644
--- a/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
+++ b/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
@@ -140,6 +140,7 @@
       args.append(contentsOf: bazelBuildOptions)
       args.append(contentsOf: config.bazelFlags)
       args.append(contentsOf: tulsiFlags.build)
+      args.append("--tool_tag=tulsi:user_build")
       args.append(contentsOf: targets)
 
       return args.map { $0.escapingForShell }.joined(separator: " ")