[Mach] Add stage command to execute stage-package.

python/mozbuild/mozbuild/mach_commands.py

@@ -1070,6 +1070,14 @@ class ClangCommands(MachCommandBase):
         print('-I%s/ipc/glue' % self.topsrcdir)
         print('-I%s/ipc/ipdl/_ipdlheaders' % self.topobjdir)
 
+@CommandProvider
+class Stage_Package(MachCommandBase):
+    """Stage the built product for distribution but do not create an archive."""
+
+    @Command('stage', category='post-build',
+        description='Stage the built product for distribution but do not create an archive.')
+    def stage_package(self):
+        return self._run_make(directory=".", target='stage-package', ensure_exit_code=False)
 
 @CommandProvider
 class Package(MachCommandBase):