[DDW-844] Add an experimental GH actions step which lets run Chromatic with label

Author: Marcin Mazurek

.github/workflows/chromatic.yml

@@ -1,12 +1,15 @@
 name: 'Chromatic'
 on:
-  workflow_dispatch:
+  pull_request:
+    types:
+      - labeled
   push:
     branches:
       - develop
 
 jobs:
   chromatic-deployment:
+    if: contains(github.event.pull_request.labels.*.name, 'run-VR')
     runs-on: ubuntu-latest
     env:
       STORYBOOK_FREEZE_DATE: "true"