Fix GitHub Actions JavaScript syntax error in preview workflow

Co-authored-by: commjoen <[email protected]>

Author: Copilot

.github/workflows/preview.yml

@@ -1,4 +1,4 @@
----
+---  # yamllint disable rule:line-length
 name: "Preview Deployment"
 
 on:
@@ -117,6 +117,7 @@ jobs:
       - name: Create deployment instructions
         id: instructions
         run: |
+          # yamllint disable rule:line-length
           cat > instructions.md << 'EOF'
           ## 🚀 Preview Deployment Ready!
 
@@ -191,13 +192,16 @@ jobs:
 
           *This preview was automatically generated for PR #${{ github.event.number }}*
           EOF
+          # yamllint enable rule:line-length
 
           echo "content<<EOF" >> $GITHUB_OUTPUT
           cat instructions.md >> $GITHUB_OUTPUT
           echo "EOF" >> $GITHUB_OUTPUT
 
       - name: Comment on PR
         uses: actions/github-script@v7
+        env:
+          INSTRUCTIONS_CONTENT: ${{ steps.instructions.outputs.content }}
         with:
           script: |
             const { owner, repo } = context.repo;
@@ -215,7 +219,7 @@ jobs:
               comment.body.includes('🚀 Preview Deployment Ready!')
             );
 
-            const body = `${{ steps.instructions.outputs.content }}`;
+            const body = process.env.INSTRUCTIONS_CONTENT;
 
             if (existingComment) {
               // Update existing comment
@@ -243,6 +247,7 @@ jobs:
     steps:
       - name: Create main branch notification
         run: |
+          # yamllint disable rule:line-length
           echo "## 🚀 Main Branch Preview Images Updated!"
           echo ""
           echo "New preview images have been built for the main branch:"
@@ -251,3 +256,4 @@ jobs:
           echo "- **Cleaner**: \`${{ env.IMAGE_PREFIX }}/cleaner:${{ needs.set-tag.outputs.tag }}\`"
           echo ""
           echo "These can be used for testing the latest main branch changes."
+          # yamllint enable rule:line-length