Bug 1799207 - Part 2: Install lit when installing storybook r=hjones

Depends on D161341

Differential Revision: https://phabricator.services.mozilla.com/D161342

browser/components/storybook/mach_commands.py

@@ -2,10 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from mach.decorators import (
-    Command,
-    SubCommand,
-)
+from mach.decorators import Command, SubCommand
 
 
 def run_mach(command_context, cmd, **kwargs):
@@ -40,6 +37,12 @@ def storybook_launch(command_context):
     description="Install Storybook node dependencies.",
 )
 def storybook_install(command_context):
+    # Bug 1790483: First, we need to make sure lit is installed
+    run_mach(
+        command_context,
+        "npm",
+        args=["run", "vendor", "--prefix=toolkit/content/vendor/lit"],
+    )
     return run_npm(command_context, args=["ci"])