Run chromatic on main after PR is merged with proper label (#3909)

.changeset/clever-pandas-crash.md

@@ -0,0 +1,5 @@
+---
+"saleor-dashboard": patch
+---
+
+Run chromatic on main after PR is merged

.github/workflows/storybook-chromatic-main.yml

@@ -1,13 +1,28 @@
 name: QA
 
 on:
-  push:
+  pull_request:
     branches:
-      - "main"
+      - main
+    types: [closed]
 
 jobs:
+  if_merged:
+    permissions:
+      pull-requests: read
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    outputs:
+      labels: ${{ steps.get_labels.outputs.labels }}
+    steps:
+      - name: Get PR labels
+        id: get_labels
+        uses: joerick/pr-labels-action@7beda983e70efd41dd55ef246d0b3bba82820f4c # v1.0.8
+
   chromatic-storybook-main:
     runs-on: ubuntu-latest
+    needs: if_merged
+    if: ${{ contains(needs.if_merged.outputs.labels, ' run chromatic ') }}
     steps:
       - uses: actions/checkout@v3
         with:
@@ -33,7 +48,6 @@ jobs:
         run: npm ci
 
       - name: Publish to Chromatic and auto accept changes
-        if: github.ref == 'refs/heads/main'
         uses: chromaui/action@a89b674adf766dbde41ad9ea2b2b60b91188a0f0 # v6.17.4
         with:
           projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}