More backtics for codefence

Author: CRThaze

.github/workflows/preview-readme.yaml

@@ -27,7 +27,7 @@ jobs:
         with:
           git-push: false
           output-file: ../../README.md
-          template-file: ../../README.md.gotmpl
+          template-files: ../../README.md.gotmpl
 
       - name: Check for README changes
         id: check-changes
@@ -84,6 +84,7 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
             const diff = `${{ steps.diff.outputs.diff }}`;
+            // Use 4 backticks for the outer fence to safely contain any triple backticks in the diff
             const body = `<!-- helm-docs-preview -->
             ## 📝 README.md Preview
 
@@ -92,9 +93,9 @@ jobs:
             <details>
             <summary>Click to expand diff</summary>
 
-            \`\`\`diff
+            \`\`\`\`diff
             ${diff}
-            \`\`\`
+            \`\`\`\`
 
             </details>